Probably not going to go down like that, but it's a matter of punishment, as well as compensating the team that was the victim. (I'm from Houston, so probably biased)
However, if the Cardinals are as smart (and perhaps as ethical?) as they previously seemed, they'll get out in front of this, and voluntarily give up their 2013 pennant, as well as fire whoever was involved in this harebrained scheme.
I'm a Cardinals fan, I admit it, but that's basically an insane suggestion. It's not going to happen and it's not smart. Why in the world do you think that would be smart?
Until there are details on what was done and by whom the Cards should do nothing more than fully cooperate with the investigation. Then and only then should the Cards and MLB decide how to respond.
Fanhood notwithstanding, this is really bad. Unless the FBI finds that someone planted a device on the network of the house that originated the ill-advised logins, someone has to burn for this. (I guarantee that Mike Matheny feels the same way.) It's not quite at the level of Pete Rose (who really ought to be forgiven by now) or the Black Sox, but like those cases it completely undermines the integrity of the sport. I used to be impressed by the Cardinals' great farm system, and I felt it indicated something about Midwestern thrift, practicality, and eccentricity. I don't feel that way anymore.
Well, ironically, that system was built by Luhnow, so I think you're allowed to continue feeling that way :)