And that’s why it will bomb if a fee is required.
People won’t pay a monthly subscription for a game that is nearly 15 years old. Sure, a few die hards may. But by and large most will not. Hell, the largest percentage of today’s WoW players didn’t experience Vanillia WoW when it was released. I’d wager they didn’t even play in tBC. Vanilla WoW is merely something they want to play. In reality that will never happen. The Vanilla train left the station nearly a decade and half ago. If you weren’t on it then you missed out. Everything after is just a facsimile. I really hate to inform you all of this. Now, that’s not say it can’t/won’t be fun. It will never be the “same”.
On a side note, Blizzard really should not have announced Vanillia at the 2017 Blizzcon unless it was closer to being finished.
One can’t compare Diablo and WoW. Diablo doesn’t require the amount of ongoing customer services that WoW does, even Vanillia WoW.
/cheers