With level 50 high level dungeons essentially becoming leveling dungeons (the exp won't be much but it's something), will high level still be high level or leveling? Will high level become fractal and neverreap? Will fractal and neverreap stay in expert roulette, leaving a nice pool of 4 dungeons instead of just 2?

My opinion:
Leveling should include everything before 50. High level roulette is now leveling roulette the sequel, including Heavensward leveling dungeons plus the other level 50 dungeons. Instead of requiring all dungeons to be unlocked, unlock as you go. Main Scenario should include Aetherochemical Research Facility for level 60s and include a decent esoterics bonus. Expert should include all level 60 dungeons from Heavensward. When overgearing becomes an issue, expert should reward the current amount of esoterics, but the freshest dungeon should reward 15 more. That way roulette rewards are the same, and farmers that go ham can gain esoterics just a bit faster.