I listened to a Twitter spaces on Drivechains yesterday. That guy Paul Sztorc is trying to push BIP 300/301. TBH, I am unqualified to know if Drivechains pose any threat to the Bitcoin network. I do know it is hard to make any changes to Bitcoin. The prospect of one last change that opens up many doors is pretty alluring.
The main thing I'd be interested in is a privacy sidechain. The Canadian Trucker incident, although it definitely could have been handled much better, shows, IMO the only thing that remains to be desired is more privacy. When CZ handed over the KYC info of Navalny"s donors to Putin, we realize that sometimes people might die due to these limitations.
The argument that it would kill all the shitcoins, however, may not actually end up working out. It implies the main reason for the existence of them is their usecase as opposed to something to gamble on. Their usecase is just an excuse to gamble on them, and they will still have that.
But, once again, I am beyond by depth trying to understand if Drivechains pose a threat to Bitcoin.