I should clarify when I'm talking about DEXs I'm talking about DEXs which allow trading between fiat and bitcoin.
I am following AtomicDex project, there is no website to use, just download wallet for atomic swaps between Bitcoin with bunch of other altcoins, and they are going to add fiat trading soon.
Let's see how that works in real life, but it looks very simple to use and there should be no kyc verification, it's much simpler to use than Bisq and there is no need for Bitcoin security deposit.
They are implementing support for it, not moving to it altogether. Bisq as it exists currently will continue to exist and still function as it does (and actually with some improvements to the high fees you mentioned by reducing the number of on-chain transactions required)
As I said Liquid that is not decentralized will be used as base protocol and Bitcoin main chain will only be used as alternative option.