The SNES mini will probably come with a few dozen games...period, therefore, the "market" won't crash, but there is a potential (however slight) that said handful of games may lose some value...who knows.
And to clarify, my collection is NOT static. I have traded and sold and re-purchased certain games many times.
Oh, and on a bragging note, I once rented out a part of my collection for a friend of a friend (both of whom are devs) for $1,000.
The deal was $1,000 for 5 days, and said lot included certain Super Famicom games as well.
...and I didn't "make a deal" by the way, the dude knew of my collection, (from his buddy telling him about it) offered $1,000 for part of it and that was that.