Just my opinion, but making it so when a new expansion comes out, the previous one becomes a CT option and we go back to 50 to re-level to 60 makes the most sense. To me the only other options are:
- The next expansion is 60-70, then 70-80, 80-90, etc. This brings us back to the issue the squish resolved where new players/alts, have to go through numerous expansions worth of content to make it to max level. To me, going from 60 back to 50 at the end of the expansion is less jarring than in 6-8 years going from 100 back to 50.
- The new expansion is 60-70, etc. and CT is adjusted so the cap is the same as the previous expansion's. This means CT would be 10-90 by the time we get to whatever expansion the new cap would be 100. This would be a massive undertaking as you'd have to stretch things like XP out so much to make it so you could level just in something like Outlands from 10-90. They'd basically have to make it so you do 3-4 quests per level. This to me would seem weird and even more so drive home the point that the level next to my portrait is meaningless, since you could do some hubs in Outland, Zangamarsh comes to mind, and level 2-3 times in the 30 seconds it takes you to turn in the 8-12 quests you have at once.