Have you run the numbers? It would be hilarious, in a way beating them at their own game by feeding them so much data that they can't process it anymore.
Such an approach would require encouraging tens of thousands of people to download and use Wasabi and compromise their own privacy in doing so. Not a great approach.
I do still believe it's glorified CoinJoin, with the shortcomings that come along with such a band-aid type solution. But glad to discuss!
It's a fundamentally different approach, and overcomes many of the downsides of coinjoining. Ring signatures are constructed locally and do not require any input from the ten decoys you use, meaning no centralized coordinator, no liquidity problems, and no coordinating with other users. The outcome of a Monero transaction is not a case of "this input is definitely linked to one of these outputs, but I don't know which one", but rather "I don't know which input is being used, and I don't know where it is going".