There will never be a return to 2008ish numbers because we have a different gaming climate. At it’s peak, WoW was also the peak. It was the online game everyone knew about, talked about, played, or at least had sort of heard of. It was a gaming sensation.
Today, even if it was better than it had ever been in every way imaginable, it is competing against games like Fortnite, Apex, PUBG, Overwatch, a myriad of FPS bro shooters, LoL, and a million other games that simply didn’t exist back then. People’s focus has also shifted away from the open world, go-exploring and quest for epic loot pace to the E sports speed and competition of instant gratification lobby games.
That isn’t a bad thing, the gaming world will continue to move on and adopt fads and explore the new hotness, but WoW needs to focus on being the best it can be, not trying to be what it was.