"Mentor Whiplash" is real and has already been felt. Whether or not it will get worse remains to be seen. :)

Getting in to one of these things is a bit like winning the lottery, but that doesn't mean you shouldn't try for it. Regardless, there have been successful businesses started with both the "fuck my job, I'm going to do this full-time" and the moonlighting approaches. Do what makes sense and feels right for you is all I can say.