I think alts are overhyped and Bitcoin dominance will come back over the years to come. I think the recent alt hype was a stage of the denial of Bitcoin. In 2016 BTC was not interesting, but blockchain was. Now you hardly don't hear anything about blockchain anymore......
In 2017 BTC was not interesting, but altcoins were. In 2018 this will die out and people will understand that the most robust, most innovative and most used blockchain is the Bitcoin blockchain.
maybe however this adopted groups btc & altcoins it's a mistake, there are +1500 "altcoin" and all cant be in the same group