I think that market cap will begin to spread out into the altcoins because of the scaling issues. Right now, Steem and Bitshares can do this without breaking a sweat and then EOS (all developed by Dan Larimer) will probably do very well next year. Bitcoin is waiting for off chain solutions such as Lightning Network and Schnorr signatures. Hopefully they will come online soon, but I suspect we could be waiting another year or so. I wrote about this quite a lot over the last couple of months on my blog.