here's another little nugget of information that i wasn't aware of until recently regarding yale SOM. apparently up until recently (maybe 10-15 years ago?), yale only gave out an MPPM, which is kinda like an MBA, but geared towards non-profits. it's because of this that yale's reputation as a top notch school for the nonprofit industry came about. however, yale then switched over to a more traditional MBA degree. their alumni base is therefore not as strong as some of the more established schools (since most of the alumni worked only in nonprofits), but with time, the alumni base can only grow.
i think if they properly leverage their position with their other schools (by pushing their dual degree programs, and also by creating exciting electives at these schools and promoting them heavily), they will continue their upward trend. even though they are ranked in the 10-20 range now, this is a very far step up from 10 years ago, when they were on no one's radar.