Have you read Peter Todd's approach to tail emissions?

It's not cutting a thing in half. Thats basically what we have now converging on 2.1 quadrillion.

Peter Todd has been advocating for years for a transition to a fixed block reward. The goal being to ensure miners continue to have incentive to mine blocks, and that this would in theory pseudo replace lost coins over time under the guise that coins go up is better than coins goto 0.

Check out the article on his website petertodd.org