I understand it is difficult for Ultimate players but I think the issue lies more in how small the number of players who actually attempt Ultimates is rather than the size of the datacentres. Considering the bigger picture, it makes sense why they split the datacentres and while ques are arguably longer than previously at times, on the whole for me personally they feel pretty much average. There is the added boon of not having stupid crashes, errors and login ques during the expansion/ patch days.

Backtracking slightly, I think the greater issue is in how few people actually want to do ultimate. I'm not saying it should go, but I do wonder if there is a way to make it more appealing and accessible.