I agree, the problems I identified can be resolved. How they are resolved is a choice for the developers. I'm sure there are many other issues too. No issue is unable to be resolved (in theory). As we have seen with patch 19.1, the implementation of a change may not match up to the expectations of either the developers or the players.
Merging worlds has been suggested in the past. Also closing older worlds after a certain stage has been reached such as less than 50 logins within a month or 6 month period.