This seems backwards.
Privacy is a common good. If individuals, for whatever reason, take actions that hurt their own privacy, they are transitively also worsening privacy for everyone they interact with. The public nature of a blockchain means that any information revealed by anyone worsens the situation for everyone.
We can’t prevent people from reusing addresses, or otherwise leaking information. But we (we being the collective of Bitcoin users that jointly decide the system’s rules) can incentivize that behavior (through changes like the ones you propose here) or disincentivize it (through CISA, e.g., as it means CoinJoins slightly cheaper than individual transfers).
In any case, you shouldn’t use the fact that some participants choose to give up their privacy as evidence that it’s desirable to incentivize it for everyone.