Well, they announced a kickstarter so funding is not secured and it might never appear. Also in terms of sales and amount of people who have been waiting for the game, I think FFVII beats Shenmue :P
And Shenmue 3 beats FFVII anytime because it's a new game, not a remake. It's not about how many it sells. It bring closure. FFVII is great, but just more of the same thing.