Yeah that’s possible.
I feel like ActiBlizz is just going to push them (Shadowlands only got a roughly 1 month delay). But, to your point, it’s possible with the quick exit of sub numbers, no blizzcon for 2 years in a row, no new games coming, maybe corporate will agree to push the 2 year xpac to something longer (additional 6 months?) in an attempt to put out something really big and bring back fans. Given that Blizzcon is essentially re-scheduled to Feb now I could see this change happening too.
I’m still convinced that WoW is eventually going mobile to appeal to a bigger (and different) audience. Probably another 3-5yrs. They told us they hired more devs and are building warcraft mobile titles so…yeah.