How does replacing Ash fix the problem? Inserting another protagonist with bad writing isn't fixing the problem. It "might" fix the problem, but again, what kind of benefits or guarantees does said fix have over doing a better job with Ash?Because that's exactly the problem: they aren't improving Ash OR the writing in general. How did a boy who KO'd two legendaries in the Sinnoh League crashed down horribly to lose to a noob who brought five pokemons to a 6-on-6 battle? I don't call THAT improvement.
There's no issue with wanting to see a new lead protagonist as a personal preference (or yes, keeping Ash for personal preference alone). Blaming all of the writing issues on Ash holds no water. There are ways of improving the anime while keeping the current lead, and AG and DP were steps in the right direction.