I think we are already seeing the future take shape.
It isn't going to be a "one size fits all" proposition. We are already seeing how other coins like ETH, DASH and a few others have evolved to address more local and specific markets applications.
From what I'm observing now is how the other coins are bringing stability to bitcoin and cryptocurrency applications.
It is perhaps our old way of thinking to seek the supposed "one" coin of the future is not the right way. After all, the super computing tecnology which we have at our fingers could mean everyone might have their own personalized coin...
Who knows, but the possibilities seem rather big and beyond anything we can imagine now.
Back in 1993 the technology we take for granted now was unimaginable.
We are on the cusp of a similar step of cultural/techno evolution.
Hang on for a wild ride!
Whatsoever, I believe Bitcoin is the future currency and no other digital currency can take its place ever. If others will show improvement then BTCs is not sleeping either.