The proposed series would have been a miserable failure.
There's no way you could possibly know that.
Even if it wasn't that great from the start, it would have been the flagship series of a new Paramount TV network, much like Voyage on UPN. The ratings would have been high because there was NO other Trek available beyond the TOS reruns. It probably would have been given time to develop, much like TNG got to live down it's shaky early seasons.