I think that's unlikely, given what it offers beyond currency. People are thinking only in simple terms at the moment but the prospects of it's being used for trade are unavaliable yet offer huge potential. Even if the currency element is frustrated by central authorities, it's unlikely to fail .. it might evolve to not be BTC but if devs overcome known issues, there's little reason it won't be useful for a long while yet. It'll be interesting to see if Turing complete capability can work, that obviously offers a strange new world.
Nobody can say. I'm sure digital / cryptocurrency or some form will still be around, but I'd say It's likely something will come along that improves on Bitcoin's foundation.