Bitcoin is definitely facing problems right now, and Ethereum is the hot new thing. I think Ethereum could easily establish itself as the second place crypto, and until the Bitcoin community finds some sort of plan to progress and evolve past the blocksize issue, the number 2 crypto can slowly take momentum away from #1.  I don't see any crypto eclipsing Bitcoin anytime soon, but I do see room for Ethereum to continue to expand it's lead over other alts in terms of capability and popularity.