Is it? I hadn't heard that. You mean my Firefox on Linux is vulnerable right now because of outdated Flash?
They're going to provide security support only (no feature updates) for what I think is the 11 series for a little while. Only way to flash 12 is Google Chrome.
Good news is that more and more stuff stuff out there doesn't require flash, and more than just videos, some kinds of various animation and soundish type stuff is being done without it now too.
As for distro, the problem is probably just the lack of good 3D support on old hardware for the stupid modern GNOME3's and Unity.
Were AGP 2x ati cards and chips in the Pentium III world ever able to do OpenGL even on Windows, or were they just Direct X and/or programed directly by specific games?