Despite clearnet being a major attack surface for Monero. If monero was tor-only it would be unstoppable, maybe. Pure darknet money.
I think pure tor ecash mints will beat them to the punch.
Discussion
Network privacy isn't a unique problem for Monero. That applies to Lightning and every crypto. Monero also has certain privacy guarantees even when using clearnet like amounts and addresses being hidden.
I think ecash is pretty cool, but I don't think it's likely that merchants on DNMs, who already have to trust the market to escrow funds, will want to take on an additional counterparty risk with ecash...but we'll see. I think it is slightly more likely once ecash introduces blinded amounts.