Hypothetically here of course.
Lets say the game had drop in drop out co-op system. Raids are soloable its engineered in a way that you still get that raid epic feel, an army or group of heroes taking down big baddies, but a raid full of AIs or something.
Have system similar to rare spawn tagging where the more people are participating, the harder and beefier the boss is. (with better rewards)
Would you still play?
Tell you the truth I would probably be more apt to play personally.