I think there should be a better combintaion of real world and HD world baseline prestige. The advantage, as I see it, of having HD baseline match RW is that it allows for a quick glance at various schools to know which one's "should" be good and which ones will take a lot of effort to build up. This is especially true, as some people have a hard time finding the baseline prestige of each school and it can be a pain to have to refer to that list all of the time if it is too out of whack from RW.
On the other hand, a team like St. Bon in Iba referenced above, should not reset to a low level baseline after such prolonged success when the coach leaves. Instead, it should receive a significant baseline bump. That said, while a team like Gonzaga has gained a lot of attention over the years in RW and had some success with multiple coachs, if Mark Few left, I don't think big time coaches would be clamoring for that job the same way they would for, say, Wake Forest, a team Gonzaga has arguably outperfomed over the last 10 years, but one that has a more storied history and the advantage of being in a big time conference on the east coast (i.e., better TV exposure).