> - This may or may not mean that major distributions binary packages will simply stop being verifiable - it depends on who uses what key server in what chain of trust. We probably won't find out till more bad actors poison more wells

All distributions I know use a pre-shared keyring for package signing, distributed on the initial installation media. Public keyservers are not involved.

This is unaffected by any issues with web-of-trust and public keyservers.