assuming satoshi can still move their/his coins, this is a likely reason why it's not happening. Although we shouldn't discount the most conservative thing that all 2009 era mined BTC key holders could do; start by moving their BTC with the highest block number, and do it very very slowly. Satoshi could potentially do so too (we have zero clue what's going on with satoshi in so many ways), so assuming that chaos was not the intention, I expect that if those coins ever did move, that's what would happen; starting at block ~50,000, then working backwards from there.

In such a sequence of events, it could be interpreted as a signal that those early miners are losing confidence in the safety of ECDLP protected coins. Of course, those people may have other reasons to not publicly announce why they're moving to different keys (which are not necessarily anything to do with the safety of the public key cryptography), so you are indeed correct; the lack of information will cause uncertainty, and the uncertainty will rock the Bitcoin ecosystem.

I hope such people (whether satoshi or not, there are others) are reading some of these discussions (it would surely be prudent to do so). If so, I also hope they will consider a slow and orderly move to new key types, and act sooner rather than later.