I'm personally not bothered by content lulls. I have lots of alts, like achievement hunting, and collecting every unique weapon.

But my enthusiasm to play would vanish the moment they go the route of KMMO. Any RNG gear upgrading with a chance of breaking or lootboxes would make me consider leaving the game immediately. I was there until TERA's bitter end and I don't want to experience that again. I would rather just go play WoW and leave my last memories of FFXIV as positive.