Since they're no longer in the same division as the Astros, it's a bit less of a penalty, but I'd say every game since the initial breach against the Astros should be forfeited. Additionally, any draft picks during that time should be awarded to the Astros. (not the actual players, but that means they owe the Astros N first round picks, etc)

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)