What's killed my interest in both WoD and Legion after the first 2 months is the consistent gating going on. Blizzards "pacing" sucks.
I'm a junkie, I keep playing for hours on end when I put a day aside to actually play, and then being constricted in how many x you can aquire or how far into y you can progress over n weeks instantly makes me lose interest.
I feel like i'm "losing out" by doing those dungeons when i'm not getting more of that particular one this week.
I really hope they go for a more unlimited approach.
One can dream right?