I predict it'll pop sometime around the time we start traveling around to other star systems and it being tied to the terrestrial Internet will be its big drawback, just as money needing to be sent over long distances quickly was gold's downfall.

Everything's a bubble; just depends what sort of time horizon you look at it with. 

 definitely. we’ll need something different, and a different internet as well.

keeping your bitcoin node in sync would be annoying. ecash actually might make the most sense?