Great! One solid way to do this would be to set TARGET_GASUSED as a hardcoded value, especially for Ethereum Classic.
Incentives
The full-nodes are the ones that have no input, output, or incentive no matter what you do to this market (it is between miners and users alone). Full-nodes are essentially volunteers so hard coding the TARGET_GASUSED low enough, such that anyone interested in running a full-node can do so without significant cost. Of course “significant” is a matter of debate but having users or miners affect this value is worse than developers, as their incentives are known to be different than full-nodes, however there is no way to get a sybil-proof opinion from them so as a consolation the devs (having less of a conflict-of-interest) decide. Ethereum of course has different security tradeoffs so I would love to know if you have a different variation. link?