i think the world has to accept bitcoin first if any altcoin is going to succeed.
Would guess the same as well. Assuming Bitcoin is succesfull there might be a need for a "better" Bitcoin 2.0, whichever one that might be then, in the future, but if it fails miserably its pretty unlikely anyone will want a "better failure".
they can always make changes to the bitcoin protocol as long as the miners accept them / updates the clients.