hmmh... I think adding a Proof of Stake component to mining could be done as a soft fork with a BIP9-like activation procedure and even better, it would be an UASF soft fork where miners don't really have an effective veto.
After that, the PoS components could be used to measure fork acceptance among holders too rather than just miners
for example, you could pick 5 random bitcoin holders for each block and require a signature from each of them for a block to be valid.
it could also function as a method for UASF style soft-forks in the future
you could roll such an update out to users and have them start signing blocks and only active the actual validity rules when most blocks have been ending up receiving valid signatures for a difficulty period.
if miners go on a strike, that could perhaps be pre-empted with a PoW algorithm change and/or difficulty reset if we don't see enough block for a while right after the activation.
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bsm1175321
Proof of Steak is a circular argument and leads to centralization. Since there are no longer any economic inputs to the system (coin creation is inflationary), the only way to make money is by taking Steak from others, and the net assets are flowing from holders to steakers.
This has been argued to death and I don't want to see it ever in Bitcoin.
In addition, one of the problems with the idea of "it's been to long since a block, let's reset difficulty lower" is that it makes it near trivial for a sybil attacker to make your node accept its alternative chain