They will survive as long there is demand. And currently not so much demand, hence the low volumes DEX have.
With all the regulations coming in different countries, and maybe the situation of some countries we can suppose the demand will increase in the future, then we ill have different groups of people.:
The one that will use the DEX, I doubt any decentralized exchange will become as big as Binance or let's say Bitfinex/Bitstamp. I think instead we will have many small DEX, with each a different type of community/targeted audience
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DEX: Decentralized Exchanges List)
Another group will make use of atomic swap:
As another user mentioned, it will be easier for people seeking to avoid the use of a 3rd party. Not many will use atomic swap, I think those who are usually called a geek or a purist.
And we can think another group that will use privacy coins + DEX. For whatever reason they have.
Traders won't be interested to use DEX no matter how fancy it is. These people are pro traders managing large funds, it's their job/business, they usually live in a hyper-regulated industry in their own country. Don't even dream about seeing an institution investing via a DEX
