[yellowapple]

Of those satellite projects, the only ones about which I'd be worried are GTK and GNOME. GCC is already supported by the FSF (and if the FSF can't do it, then I guess that's one more reason to start migrating toward LLVM/clang), Cygwin isn't as big a deal anymore (MSYS2 can pick up the torch, and Windows Subsystem for Linux helps, too), and PulseAudio - while certainly better than it was a few years ago - is not the end-all-be-all of sound systems (sndio, for example, is way more pleasant IMO, and is now available for non-OpenBSD systems - Linux included).

[bonzini]

GCC is not supported by the FSF. Contributors are mostly ARM, IBM, Red Hat and SUSE.

[yellowapple]

Wait, what? Is it not the GNU Compiler Collection? It's part of GNU, which is a FSF project. Not sure about actual developers, but Richard Stallman himself is still on GCC's steering committee last I checked (among various other individuals, including multiple from Red Hat). The donation link on GCC's homepage also points to the FSF's general GNU donation page, which strongly implies the FSF is the one controlling the project's finances, too.

Regardless, that's even less reason to be worried about Red Hat totally collapsing, then. Plenty of other companies - large and small - to pick up the slack (and I highly suspect the various Red Hat contributors would probably continue to contribute anyway).