I don't see why Shenmue can't be put up for preorder by Yu then? Will you be happy if the development falls through and end up with neither your money or the game, but there had been a chance the game would be made? If yes then by all means fund the kickstarter.
The issue is when everybody decides to make a slightly risky game have a kickstarter before they will fund it. It would be one thing if the kickstarter money was going to be a significant portion of the Shenmue funds, but if you look at how much a game costs to make that $2 million goal is quite insignificant to the estimated overall budget of the game.
It's such a low-risk investment at this point that your worries are really baseless.