>>14095119They will be around forever since you can get females with hidden abilities, Pandora's box was opened. Also I think the launch distribution torchic will have speed boost which means literally everyone who buys the game at launch will have one.
They're releasing a new online thingy with X/Y and I assume there will be some way to get hidden abilities through that, or in game. A large chunk of the most relevant hidden ability carrying pokemon can also be found in grottoes in BW2, including multiscale dragonite, moxie salamence, drizzle politoed, and drought ninetails.