Since learning that apparently delve-dropped green gear LEVELS LIKE HEIRLOOMS (I know, MIND BLOWN!) and in participating in delve-focused leveling, I really think that the additional leveling gear drops represented by mysterious satchels closes the loop on delves providing enough gear to be a solid leveling route.
We don’t necessarily need the XP potions and other potion-themed effects to go off forever, but I haven’t felt bereft of gear while delve-leveling during this event, as I often do doing all the delve leveling I consistently do with my alts. The potions are clearly a “boon of the event,” but the level of gear acquisition from the fun appearance of satchels make delves feel like a solid leveling activity that feeds both XP and loot in proper proportion.
Next expansion it’s reasonably safe to assume that TWW will be a 10-80 leveling timeline, so delves really should be supported as an alt leveling path with augmented XP beyond the delver’s calls, and also this satchel-sourced loot income.
It’s leveling gear, it’s allowed to rain from the sky, and it should.
(Especially if we’re seemingly abandoning the idea of timely “current expansion” heirloom updates, which… yeah those are officially late now.)