The only answer that respects the foundational principles of Bitcoin is to do nothing. The owner of the coins in all P2PK addresses need to make their own decisions.

That being said, if (that is a big IF) there was a way that makes sense that would sort of recycle these coins into a perpetual block subsidy of some sort, it might be interesting. But then again, I see no way of doing that without violating someone else’s property right.

Interesting debate though. At the end, Bitcoin should be something where you could go to sleep for 25 years and when you wake up, nothing fundamental has changed except that your coins are worth more.