What you usually did 3 months after raid release? Hunting 0.0001% titanforging piece? Grinding side content to max out artifact?
Right now it's time for alts, doing side content you usually don't have time for or just break from game. Extra layer of grinding and gearing would make people play longer, but with higher risk of burnout. Just think about BfA season 2 (if you remember) - amazing raid, most alt friendly period in WoW history (quick leveling and gearing, very fast catch up for necklace and before 8.2 essences), but people complained 24/7 after s1 burnout.
Don't really want comment people announcing end of world cause sub dropped post launch.. after 10 years it's just pathetic.