Insurrection may have been the film that decided TNG had only one more chance, but had that chance been successful, had Nemesis been a hit, you can bet that another TNG movie would have been made, despite the 'end of a journey' messaging that went along with Nemesis.
I don't want to derail this, but if Nemesis was a hit and more TNG would have come... how could it be?
They made a point of splitting up the crew to go their different ways. Just toss 'em back again for the next movie? Like the thing they do with Worf, everybody just shows up again with no rhyme or reason?
Okay back on topic...