It's not completely pointless at all! If sufficiently many users are willing to run a microminer at a small monetary loss, then it becomes practically impossible to run a commercial mining farm. I think we're quite far away from that scenario, but it's a theoretical possibility. I hope that eventually a hundred million people will care enough about decentralisation, and in that case it might happen.
You astutely describe my design for eliminating commercial mining. But I don't rely on them caring about decentralization.
If you can market it as a lottery, it may work.