I'm sure this has been asked before but I didn't see any recent posts about this in my, admittedly, brief search of the forums.
For those who are no longer playing the game, what would bring you back to the game? What would you like to see in perhaps a new expansion?
For me I would like them to focus on making the classes fun again and do away with the convoluted temporary power systems. I feel like those systems only serve as a weird grind that makes it less desirable to play alts or even other specs.
So I think it would be cool to get 4th specs for the non hero classes and just work on class/spec identities and make them fun to play. Take a look at some balancing. Why have Disc priests and Holy Paladins been so dominant for M+ for so many expansions now? (because they provide both the most dps AND the damage reduction Healing CDs) just as an example. I think 4th specs would also allow for other classes to do roles they normally wouldn't be able to do.
I know a lot of people are against the 4th spec thing but I think it would be cool.
Secondly, just focus on a system that is fun primarily and design it with the intent that it could stick around as a permanent feature in the game. Torghast had so much potential as an alternate way to play the game. Just turn the powers up to 11, offer more build paths (it really needed like 3 times the amount of powers just to start). I could go on an entire rant about this but I will leave it at that