How are exchanges going to agree to rollback after they have already exchanged those tokens with others? Someone has to burden the loss, so it might as well be the original blockchain that got exploited.
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Yes! This is exactly the premise of Jeff's essay [1] that I mentioned in comments below.
This gets messy fast when there is an issue and even worse is that there isn't a published plan for how to deal with things when they do come up. Everyone is betting on it all executing perfectly and given the complexity and value at stake here, chances are that at some point now, or in the future, it won't go well.
[1] https://github.com/stickfigure/blog/wiki/Proof-Of-Stake-Wear...