First of all , I am happy. You see Blizzard, these are the streamers you give early access to your game every expansion. Serves you right!
Now to my reply:
Retail WOW is dead.
It got severly injured with MOP, its condition got stable with Legion then BFA/SL killed it.
There is no saving WOW.
What they can do is release WOW2 as a real MMORPG. Take the basic Classic elements such as old talent tree, difficult leveling no LFD/LFR, most importantly RPG games elements that were removed due to convenience and build it up from there.
Don’t try your monkey grinding systems. Keep it simple, but deep. Oh and no Pandas.