I'm seeing a lot of concern about how to level once MSQ roulette goes away because so many players found it an easy way to get XP.
MSQ roulette really wasn't that exceptional for XP when you considered the time spent in the duty. You could do 3 level appropriate dungeons in the same amount of time it would take to complete Praetorium and get about the same XP.
The big difference is that you would only have to sit through a queue wait once for MSQ roulette to get that triple XP. If you are using dungeons to get it, you have 3 separate queue waits eating into your time. While there is other content you can do while waiting, it's still an annoyance.
This is where something could be borrowed from WoW. Back when I was still playing (and assume it's probably still true), players could queue for 3 different LFR wings at the same time. You'd be placed in the first available wing while your position in queue would continue for the other two. Usually the second wing would be ready as soon as you completed the first, and the third would be ready on completion of the second. That way you effectively had just a single queue wait instead of 3 separate waits.
It would be nice if something similar were implemented here with Duty Finder. Allow players to queue for up to 3 different duties/roulettes at the same time and have their positions in queue maintained for the subsequent duties. It would ease some of the frustration in leveling additional jobs caused by waits in queue.