You don't really need much to be sure is pure fiction...
List 10 Most Played MMORPGs of 2021 (updated 07/2021) :
1. World of Warcraft (2004) ACTIVE PLAYERS : 3,266,477
2. FINAL FANTASY XIV: A Realm Reborn (2013) ACTIVE PLAYERS : 2,433,964
Does anyone really think Blizzard would send to pasture their ~30M dollars PER MONTH revenue (on subscriptions alone) while it still holds almost 1/3 more players than the second most played game?
That and drop Overwatch after what they already spent to try to make it a e-sports thing...
Blizzard will milk WoW even if with just shity expansions till its no longer profitable to do so, and considering the ~350M dollars per year that is still generating (a lot more than most AAA games budget (that i can think of, only RDR 2 had a budget larger than that)) it will still be a good while till that happens.
Also doubt they would use a name already used by a fortune 500 company in tech.