I'd say for most people, of any age, the chances of becoming a compeititive world class fighter are slim. The fact is most people don't have the heart and dedication to do it. Everyone that said you didn't have a chance probably fits into that category. They don't believe it's even possible to become the next Bas Rutten so they don't even try. Or they do try but they don't have the dedication to devote themselves to the level of training required to excel in the sport. I think one of the best advantages wrestlers have coming into this game is not that we are good at controlling position, but that we've walked this road before and we're no strangers to hard training. The same applies to athletes coming in from any sport.
But even if you pass that barrier, and train your ass off, you still have another obstacle. Coming in late the major question is how fast do you learn? If you devote yourself to the sport 100%, learn everything you can and train as hard as you can, do you have the potential to develop the right tools? Some people learn techniques effortlessly. Some people gain muscle at unbelievable rates. Others, well, just plain don't.
And the hardest thing to overcome is the amount of bad information out there that is availlable to you. There are so many garbage training programs, inadequate diets, and worthless McDojo's out there that it's hard for most to know if they are really doing the right things. Most beginners don't know well enough to tell the difference. It's a shame that a lot of people are really dedicating themselves to training protocols that will never take them to where they want to be. Think about all of the 'martial arts masters' that were destroyed in the early days of UFC because they found out that they didn't prepare themselves the right way.
So you have to answer a few questions for yourself. Do you have the heart and dedication to do what is needed? Do you have to potential to ever even make it? Do you learn fast enough, have the right genetics, etc? Are you doing the right things with you training and nutrition?
My answer is a confident yes to each of those questions. And that brings up the last attribute you need. Confidence. You need to know in your heart that you can do it and that your are doing the right things. You can't let some keyboard warrior sitting on his ass discourage you from going for your dreams.
It sounds like you might be off to a good start yourself. You're training and you claim to be learning fast. You're training with a lot of different people which is good because in time you will learn whose advice works and whose advise sucks. Don't let yourself be drawn in to believing any one coach is going to take you all the way, at least not until you've learned enough to know if the gym really has everything you need. Stay with your multiple gym multiple styles approach for now. And have fun. If you don't make it you want to have at least enjoyed the experience.
EDIT:
creedseebas said:
Here is what i plan to do. Go up in weight to weigh about 160-165 and then cut dwn to a lean 150-155, with what i expect to be 9-11% body fat....
BTW, this shouldn't be your priority right now, if it is. Changing your body really isn't that hard. You can drop 5% bodyfat within a few months with the right dieting. A full year of training and proper nutrtion can dramatically change your body composition. Two years can develop some serious strength. 3 - 5 can turn you into an animal. Right now, with your timeline you have 7 years before you turn 30, which I take it was your goal. That's plenty of time. Skill isn't that easy to pick up, though. Start your strength training now but keep your focus on your BJJ/kickboxing, don't worry so much about bodyfat, etc.