At least average players (if that is the worst outcome) are still able to play and help the team.
Taking a risk on Oden is in no way different that taking a risk on the draft pick. With that pick you could very well end up with Darko and really when you look at it, the value you get out of Darko and the value you would get out of injured Oden is no different. It has no significant effect on the franchise either way.
Sure you screw up a pick or a trade but its no different to any other team. You can't get it right every time. I would rather see us fail by trying to do something as opposed to failing and not trying anything.
This is a high risk-high reward type deal but if you don't take risks, you can't win.