If you're really primarily worried about the sea of scams, I think the focus on crypto is misdirected. My opinion is this tsunami of money flowing into ponzis is way bigger than crypto, and looking at crypto in isolation is missing the forest for the trees.

The astronomical rise in ponzis and scams corresponds with the rise in quantitative easing in the world's central banks. Effectively creating a tax on not owning assets. There's been a large scale, mostly proportional, transfer of wealth from poor to rich going on, and people are now tripping over themselves trying to play catch up.

From reading about the history of periods of hyperinflation/asset bubbles, it's clear to me that people will find any way to get rid of their money when they think it's going to lose buying power, no blockchain is needed for that.

Stopping blockchains themselves would have very little effect on the number of scams. Hell, most of those scams don't even use blockchains and decentralized technology at all. They run on centralized copycats and are centralized themselves. Not much to do with crypto except hijacking the aura of innovation. Nobody can shut down Bitcoin, but they can certainly shut down Binance/BSC.

Now, wonder why aren't governments doing more to stop their people from investing in scams? You had the whole WSB GME saga. You have the Miami governor hyping Bitcoin after his rich neighbors convinced him to buy in. And now you have literal children buying Dogecoin. Whether people lose their savings on GME, million-dollar shacks, NFTs or tulips makes little difference. The alternative to people trying to out-trade their neighors is people blaming the ones responsible for the situation in the first place. So why would they try to stop it?