ETH will rise (perhaps a lot) because it is still the Smart Contract/Token platform. But over time people will realize that Bitcoin can do ALL THAT on sidechains without crowding up the base layer with cryptokitties. Boom use case destroyed.
ETH is going to 10k, then 20k. It will stick around because they won't let it die and some institutions are buying them already. Plus it has the wierd (if it's considered odd) thing that it uses 18 decimal digits after the point. The coin is fundamentally different and it isn't a fork of BTC, but it does use a blockchain.
If one can get some sort of UniSwap equivalent to run on top of Bitcoin, then ... ETH is going to go away.
well, we have Liquid and we have one chain (that shall remain unmentioned) that is trying to foist executable contracts on btc.
DEX would be next, that's correct.