I think it's obvious that he'll help them in a number of ways, primarily by getting their house in order with the way the football business side is ran (transfers, salaries, finance).
But it'll take years and a hell of a lot of perseverance to change their culture. I've heard it's a terrible place to work.
So in the short-term it won't make too much difference. In the long-term, and if he survives, he could be a coup.
Ultimately, he didn't select the players to buy, coach them or help us to win football matches. That's Pep/Txiki. My head would've fallen off if it was one of those two!