However TMP would become biggest grossing Trek movie at the box office and 2nd most popular movie in 1979. TNG created by Roddenberry is the most successful Trek series ever when it was on the air.
TMP could have been nothing more than a series of ship flybys (which is the way a lot of folks think of it anyway) and it still would have been the 2nd most popular film of 79; quality had little to do with it. If they'd dumped a trek movie out in 76 or 77, it'd've been triple the TMP box office, given the trek madness of the time.
As for TNG, it can only be considered successful (as in surviving a spell) because he was out of the way early on. The real miracle is that it survived long enough for Piller to breathe some life into it, and also survived how 'normalized' it got when Piller's approach stayed too much the same.