This is just my personal opinion. The 2 day blackout for me, never meant for people to pack their bags and leave Reddit entirely. It's not a very easy task to do, and honestly, there is still lots of contents and friends back in reddit. Reddit can be sure that lots of people will simply come back, and spez will grinning while working his way to his beloved IPO.
However, the 2 day blackout has opened a new world of alternatives to Reddit. Now people know other places and other communities that can replace Reddit as a whole. Yes, Reddit will still be an influential website. Yes, Reddit will still be money driven. Yes, spez will not budge. But we can.
To me, Reddit will not crash, burn and crushed to ash. But rather, it's either went the FB way, relying to lots of ads and ~~older demographics ~~ low-literacy to sustain, or simply becoming Myspace or Digg, a distant memory that's only in name.