in my opinion what will happen is :
1. the price of Bitcoin will increase very high, because there will be many investors who are interested to investing in Bitcoin, thus making the price of Bitcoin will increase very high
2. many coin whose prices will go down or even those coin will disappear, because no investor will invest in the coin
3. exchange between Bitcoin and altcoin will have a small volume, because investors will definitely be more interested in exchanging Bitcoin with currencies (EUR, CHF, USD, NZD, YEN, and others).
that is my thought if BTC Dominance increased to more than 80%, then what about your opinion?
Thank You.
* You're quite right about more investors to be interested in bitcoin once it dominant 80% of the crypto market.
* Number 2, Many altcoin will vapourize but some altcoin will still follow the momentum surge in the price of bitcoin and that depends on the altcoins level of support, concept, utility etc.
* For number,3 the decision made by the arbitrage will determine that.