Honestly I think it's Stan Van Gundy's way of trying to save his job. He had to make a splashy move to show ownership that he's at least trying, plus if it doesn't work out with Blake Griffin, then he's getting fired anyway. He doesn't really have to worry about the long-term health of the franchise because if this works out, he'll have a solid young player, and if it doesn't he's gone within a year.
Griffin's contract is also hot garbage that could truly destroy the Pistons franchise if Blake continues his injury plague.