Wall Street hand to manipulate markets
Bcash and other forks as a political control of the comunity
Government bans
Hacks
All this won't stop Bitcoin.
1. Wall Street may attempt, and perhaps even succeed to a certain extent, to pump and dump the price if it is moving as one and has billions and billions to play with the market, but that does not amount to stopping Bitcoin.
2. Bitcoin Cash and other forks are nuisance. Don't even bother with their existence.
3. Government bans won't even ban the use of Bitcoin among its citizens.
4. Hacks have been happening; Bitcoin is still here.