Ofcourse I would, I'm sad to say Vanilla wow Is still better than Legion, yes It takes time, yes It takes dedication to even earn a rare blue gear piece but that's how It SHOULD BE, and not just rush through previous expansion zones, only to then rush through Legion zones, then rush normal dungeons, then rush mythic+ to get gear only to then rush some more because rushing Is the new meta apparently.
It's sad, but even the ahem... alternative to legacy servers has had a divide among the guys who operate the server, which could've been avoided If this legacy server Idea was supported by Blizzard last year LIKE THEY PROMISED, to take the legacy server team guys and speak to them about It only to be ignored and forced to make their own vanilla server anyway that's been alive for a year ever since and has been a much better experience than Legion so far, countless friends, adventures, encountrs I could speak of that are memorable and fun, whilst In Legion I could tell you nothing interesting other than my 23566346th Mythic+ run that's always the same thing, rush to the end by pressing W and occasionally spam unlimited AoE healing/damage.
So yeah, If they do It right I think It could work.
I'm thinking have the option for a 20 euro sub, or dollars or whatever, and the extra 5 bucks gives you legacy server access, with one month for free Initially ofcourse for people to try It out, as they did let us do for a free month when we bought the game originally and put away any doubt of people who didn't like the Idea of Legacy servers. Only thing stopping them from doing It Is Corporate pride and their masters, activision.