Not only is there no way around it, but it's actually impossible to start new networks from scratch based on proof-of-stake due to the "nothing at stake" problem. If attackers don't care if their stake gets burned (because the value is low) then there's no longer an incentive for attackers not to validate on multiple chains at once (which is what staking is supposed to prevent). All new networks must go through a proof-of-work stage of evolution.

Further, the existence of proof-of-stake coins at all means that decentralized exchanges exist, which makes it impossible to ever kill proof-of-work in a legislative sense. Even if you killed fiat exchange for $SHITCOIN entirely, once there is a coin that has sufficient value, people will be happy to have bitcoin instead of USD, or trade to Bitcoin and then over to USD. You can either ban them all entirely, or you have to live with both PoW and PoS together.

Unfortunately, crypto is a memeplex, it's like a corporation, it's a self-reinforcing living entity that supports itself (maintains homeostasis) through a series of rules and incentives, and now that it's been created it can't be easily killed. Every individual is financially incentivized to keep playing their part, so everyone would have to collectively agree to not make money by taking part, and as people fall out the incentives become steeper and steeper to participate. Would you mine on your card for $100 a day? $1000 a day?

We will just have to live with destroying our planet, because now that it's been created it's virtually impossible to kill. That was the whole point. With apologies to Alien: it’s biologically engineered to be a survivor... the perfect predator (of certain other memeplexes - meaning, states and state-backed currencies, which are also self-sustaining memeplexes with their own rules and incentives). That was the stated goal of the design, and it works! There's no "off button", otherwise it would be trivial for "statists" to push it. There is no "oops we forgot to add a limit to the paperclip maximizer" or "don't kill the people who try to stop paperclip maximization" button either. People whose livelihoods depend on crypto are highly incentivized to come up with ways (like PoS) to keep it going even if the outcomes of the overall system becomes undesirable. The day it became legitimized by the SEC, it certainly became impossible to stop it. Now you will have Wall Street money fighting you too.

You wanted an unstoppable decentralized cryptopunk future with assassination markets, that's exactly what it does. It wouldn't be unstoppable if individual or collective action (like that of a state or other group of individuals) could stop it, and it was designed knowing that people would try to stop it. All according to keikaku.

(cue the gif from dr strangelove of general turgidson's horrified realization of what he's just said)