When Bitcoin Unlimited attempted to do this, everyone worth listening to in the field opposed to the idea. The technicals are just not there, on paper dynamic fees sound great, in practice it's a mess.
It's simply impossible to implement from a decentralized perspective. If we want to transition to a decentralized cryptocurrency, we need to drop this mindset where fiat has any relevance. From a protocol perspective, it simply can't.
Peter Rizun already basically admitted that for Bitcoin Unlimited's dynamic blocksize to work, the limit of the coins would need to be increased from 21 million for it would need a certain inflation after all coins are mined.
That's what small blockers have been saying from the start. Either a fee market develops based on limited capacity, or inflation needs to increase. Otherwise there is no incentive to secure it from a mining perspective past a certain point...
