I'm one of those people, actually. To the point that I now just use emacs at work. Have slowly started using it for all things. Email, irc, im, etc. Is very very nice. Always amusing to hear folks talk about how limited it is.
But, I still can't deny that the modern IDE has gone a long way to advance what can be done outside of emacs. To the point that I just can't bring myself to think the difference between the LISP world and any other is as large as it is often made out to be.
I doubt it will happen. But if it happens the difference will be so large that you will be wondering why we didn't do that decades earlier. It's a bit like those people that work with emacs and lisp at home that then have to go to work and use Java or PHP.