I's say it's reasonable to think that it will always be around as long as someone has the code and the ability to compile it.  It probably won't be the VCS of choice in 30 years, but for people with that kind of interest, I'm sure it'll be available.<p>And hey, storage is cheap (and only getting cheaper).  Even if Github, Sourceforge, etc are gone, barring a major calamity, I think it's safe to assume there will be a backup of those somewhere, even if it's offline.