Doubt Zuckerburg would join the Bitcoin wagon for a while since he has his grudges with the Winkelwii he might hedge his bets and purchase a few but in my opinion he will move into alternative protocols like NXT Mastercoin Darkcoin Ethereum or something of that sort to spite the Winkelwii and make a second competing currency
That or invest in Litecoin just to mess with them lol.
True it still does not wipe out the possibility he will see Bitcoin 2.0 as a viable place to move his capital towards
Then again you are probably right he would support bitcoin while planning how to surpass it
(On the other hand he is rich enough already so he might have nothing else to do but fund venture capital against his grudges ^_^)