The SCOTUS is the final arbiter on issues regarding our Constitution; thus, it is directly in its purview to rule on whether SSM bans run afoul of the Constitution. That's not judicial fiat, it's judicial review.
And will rule on this soon.
Then win on the ballot.
Your argument from tradition was the same one used by defenders of interracial marriage laws prior to Loving. Moreover, states that pass any law must, at the very least, show that law to be rationally related to a legitimate government interest. I fail to see how such laws could even pass muster at this tiny hurdle.
The government actually had the right to establish racial guidelines for marriage, but they were wrong as the marriage contracted between interracial couples as functionally identical to heterosexual unions. Marriage serves two purposes:
1. To restrict, and elevate, the power of sexuality in society.
2. To bring families together for hte purpose of adding new biological members to said family - the children - in an environment best suited to raising them.
Interracial marriage can satisfy both, gay marriage satisfies neither. Gay marriage is a loosening of sexual restrictions, not a restriction that elevates through turning a dangerous passion into a socially good urge, and homosexuals are biologically incapable of producing children with one another.
And yes, before you argue: But what about sterile couples? Or older couples? Some elements of the social aspect of marriage - certain tax breaks and such, and other favouritism - should definitely be excluded from relationships contracted between people who are sterile at the time of marriage. However, these relationships remain marriage as they hold the form of marriage that would produce children, and it can simply be accidental that the relationship does not produce children. You can have sex with your wife every day for 20 years and never get her pregnant, even while technically both of you remain fertile in a scientific sense.
Furthermore, it's not even clear which level of scrutiny the SCOTUS will use here. It could very well use strict scrutiny as it is certainly reasonable to consider such laws as a possible infringement upon a fundamental right (see marriage in Loving). It could also elect to use intermediate scrutiny or some higher form of rational basis (with bite).
Marriage is a "fundamental right" (yet not one pronounced in the constitution, oddly...) which has been restricted by the states and federal government, constitutionally, before.
You seem to be all over the place in supporting these bans.
1) Society has always banned it, therefore it should remain banned
Yes. I do not see why any society should be forced to accept a new form of marriage because a minority of the population demands recognition for a lifestyle that does not even satisfy the conditions of marriage.
2) Judges should no longer have the power of judicial review; at least on issues where you think it's possible a ruling could come down overturning a law(s) you like
They should not have the capacity to overrule publically supported laws without a clear constitutional basis for rejecting such. There is no right to marriage in the constitution, and the constitutionality of marriage restriction has been established (as I showed above).
3) Most people don't want gay marriage even though the most current polling shows that a sizable majority of Americans do, in fact, want it legalized
Then win the ballots. There are no ballot victories for gay marriage! If gay marriage is so popular, then win it! Gay marriage seems now to have a grudging acceptance, but this is because courts have ruled (well beyond their rightful power) against the public will. You can get a population to accept the inevitability of something until you give them the opportunity to exercise their vote.
The first line of attack is especially dangerous, given it is basically the exact reasoning used by Taney in Dred Scott to rule that blacks could not be citizens and thus had no standing to sue in Federal Court.
Which required a constitutional amendment to overturn. No one is saying this was good, but it required us to establish a new amendment to over turn the Supreme Court ruling, and that is the proper method to go about adding new rights to the US constitution.
Moreover, I must turn this around on you: Judges can manifestly rule in such a way that is morally appalling. Considering legal rights to blacks were then granted to them through a popular process (constitutional amendments), we can assume that this ruling was very quickly so unpopular to be legally rebuked by the people. Perhaps not at the very year it was, but soon black men were recognized as deserving of rights by popular will.
Luckily, I see little chance that Kennedy would risk tarring his legacy by siding with the conservative wing on this one. SSM will likely be legal nation wide by this summer.
If he rules from law, he rules for the capacity for states to choose, through democratic methods, whether or not to allow for gay (fake) marriage to be legal. If he creates law out of thin air, and ignores established constitutional interpretations and rulings, he rules in favour of gay marriage, and we have essentially imposed, by fiat, a fraudulent variety of marriage upon American people.