Successful enough to retain the same writing team for the follow on movie? Or enough to do another movie, but with a new writing team?
They'd already announced a different writing team for the next film, so that apparently wasn't dependent on success or failure.

. I got my information from the Insurrection blu-ray which stated that Moore and and Braga had been offered Mission Impossible II very shortly after FC came out and given the demands of that and their work on DS9 and VOY Berman offered the movie to Piller. BTW MI: II had a crappy production and ultimately most of Moore and Braga's script was rewritten by another writer. 