yes because ppl like to 'forget' that vanilla had more players than BFA, even if half of them will play it, that is still far more than current playerbase
this 'niche' market has far more playerbase than current market
also for ppl who hate cash market, vanilla so far seems to have no market shop, u actually have to play, no cheat of anything, no spend 20$ to token powerlvl urself (be it boost, or just flat out buy gear from AH), so that means ppl who want to cheat won't play it either, so again great
the problem is vanilla greatest strength was community... that is something that no idea if it will be repeated or not