Steam library killed itself. Thoughts?

So, earlier today, around a few hours ago, my Steam library was suddenly showing only 3 games, and I wasn't able to navigate them. So I go ahead and restart Steam. Bad idea much? Steam then decides it needs to verify all 1480 games I have installed. So I let it do it's thing, and when it's done I try to play something. Sadly, not a single game will launch. All 1480 installed games, which includes those from two family-shared libraries, refuses to launch due to "Invalid Depot Config". I've tried all the usual fixes for this except for completely reinstalling and downloading 5TB of games; I deleted all files except for Steam.exe and the games installation directories, as well as attempted to run "steam://flushconfig".

Anyone got a possible fix that could work for this aside from re-downloading all 5TB (Which isn't an option currently due to ISP issues)?

Have a giveaway to make me feel better.