Not saying you should go out and buy bitcoin now, but logic often doesn't predict human actions.
It's clear that many people buy a little Bitcoin and then become loud advocates for the currency; repeating the facts they like, ignoring the facts they don't; which has helped to power the increase in valuation so far, but has to run out of steam at some point (perhaps far, far into the future).
The underlying technology has interesting potential but I think we'll see it evolve through several generations before broad consumer utility (either direct, or through platforms) is realized.
But the bubble always bursts, and someone always gets stuck eating the soggy biscuit.