What could be refreshed in 1-50 content range?

[Kuroka]

I wouldn't mind if they removed all the 50 hard dungeons.
I hate them all and they felt outdated years ago

Hell no they were most fun, especially if they continued the story - i deeply miss those and am sad we never will get any more...

they mentioned they're planning to do something major in regards the castrum meriadanum/praetorium, what exactly that is I'm not sure, maybe make them into solo duties?

Imo split it into lv 50 raids, would be perfect, you can have all the cutscenes before/after. Maybe even tune it down to 4 ppl.