The reason why I think itd be likely to be an exclusive is because of how careful they should've wanna be with the series. It's a valuable franchise with a big risk, so expecting a sort of partnership isnt too farfetched.
I also think shenmue as a multiplatform, expecting it to have a lot of attention to detail, is gonna require a lot of time to have it push every platform. If that wouldn't happen, one of the versions will end up being less good. I personally wouldn't like the franchise to be treated carelessly like that.