First, the "classic" games have some limitations. BTN didn't even broadcast until 2007, so anything prior they definitely don't own rights. You can bet companies that DO own them are NOT quick to give them up so easily. It might be worth it for some games, but certainly not all.
Also, a lot of the games we would "want" were not the highest-quality productions (some were "regional" only, others may have only had "local" production).
Revsine, Pizzo, et. al. are a LOT more palatable than 99% of the ESPN crews. And they are a LOT more objective. They don't "rank" on non-B1G teams after each poll, or cry "bias" or look for any excuse to tear those teams down. Try getting "objectivity" from ESPN.