A child will grow old, but that does not change the fact that it is young _now_.

LLVM _is_ the new kid on the block, and gcc _is_ old. GCC also is wise, but I think, given a) that we learned a lot about compiler writing since gcc first appeared and b) the support that LLVM has both in business and in academia, the writing is on the wall for gcc as the favorite compiler, first for X86 and ARM, later for other architectures.

Of course that may change; gcc can evolve. However, I doubt that will happen fast enough. the FSF does not like allowing proprietary compiler plugins and (I guess) has to little manpower to work on gcc.