I consider it a issue that security through mining relies on TX fees in the future. There should be some sort of on-going emission to fund miners in the future.
I think this is a fair point. It makes the future much less predictable. There's no guarantee that the long term economic design (a hard limit on supply) pans out as expected.
This is one of the reasons altcoins should exist: to test out different economic models. I think a predictably low but permanent inflation rate might be a better model in terms of security incentives. The main issue is predictable scarcity, not having a hard cap on supply.