Even though I still don't like the idea, I'll throw in a couple comments anyway. I do however appreciate the fact you've taken on board some feedback and made changes, despite how I personally feel.

Minimum item level runs still suck outside of statics, and it makes getting the best current gear irrelevant in terms of easing prior fights. It also massively increases the burden of knowledge on newer raiders who may want to join statics but would be expected to know previous tiers at minimum item level, which is no mean feat.

Nowhere in your post do you mention the capped tome upgrade items such as twines/coats/dips, nor the coffer and mount from the final fight of a tier. How would these be aquired in your new system?

Finally, and this is more of a personal gripe. Why insist on pushing players back into older and irrelevant content? Not everything needs to have an active playerbase. If the rewards are worth it people will continue to do it, if not, then leave it to die. The proof lies in things like the pony farms for 2.x primals which still happen. Wondrous Tails still has active participants. Relic weapons. Roulettes.

If content is to die, then let it, it has served it's purpose at the end of the day, and it's only natural to happen in a game such as this where vertical progression is the end all be all.

Let it go.