And TMP didn't meet creative expectations on some levels, but it was the FINANCIAL aspect of the film that caused the changes. That's why TV guys were brought in because they were used to doing more with less. If TMP had cost $5 million to make and made the money it did, I doubt you would have seen changes based of creative failures. Instead it cost a ton of money and wasn't a hit of Star Wars proportions.
This really makes no sense. Roddenberry or no, Paramount held the purse strings and would control the budget regardless of who was making the film. Part of the reason The Motion Picture cost so much to make was because it had the costs of various aborted attempts to restart the series added to its bottom line (Superman Returns had the same type of accounting).
If Paramount had been happy with the number of tickets TMP sold, they could've went straight to a sequel without any major changes. That would've saved them a ton of money. They could've done Roddenberry's "Spock shoots JFK" flick for a much smaller amount than what TMP cost.
Simply put, there is nothing that would make one think that Paramount was happy with how TMP performed.