In terms of a movie after Nemesis (as I think this is turning into a thread about what Nemesis did right or mostly, what it did wrong), I would have liked to have seen a movie that incorporated more aspects from DS9 and Voyager. While I guess no one working on Nemesis thought for sure it would be the last we'd hear of the 24th century (aside from the series finale of Enterprise), it would have been nice to include more of a wider 24th century aspect, instead of a reference to the Dominion War and a cameo by Janeway. How? Honestly, it would be tough to do so, but that's why they get paid the big bucks and I don't! 
M-Red has a good idea in including Q, as I was a little disappointed that we didn't get to see him in a movie. Perhaps the Enterprise could have been sent on an exploratory mission into the Delta Quadrant now that the Dominion War is over. Not sure how to work Voyager into it, unless the Enterprise was ordered to assist/save Voyager. Honestly, this plot would lend itself more to the DS9 cast, though some cameos from Voyager personnel might work.
Again, not sure how it would work without becoming a mess, but I still would have liked a better coda to the entire 24th century. The best way I could see that happening would be to do another Borg movie, with the Borg coming through the Gamma Quadrant, setting up the Enterprise to coordinate with DS9 and at least consult with the Voyager crew since, aside from the Enterprise, they had more encounters with the Borg and even have a half-Borg crew member.

M-Red has a good idea in including Q, as I was a little disappointed that we didn't get to see him in a movie. Perhaps the Enterprise could have been sent on an exploratory mission into the Delta Quadrant now that the Dominion War is over. Not sure how to work Voyager into it, unless the Enterprise was ordered to assist/save Voyager. Honestly, this plot would lend itself more to the DS9 cast, though some cameos from Voyager personnel might work.
Again, not sure how it would work without becoming a mess, but I still would have liked a better coda to the entire 24th century. The best way I could see that happening would be to do another Borg movie, with the Borg coming through the Gamma Quadrant, setting up the Enterprise to coordinate with DS9 and at least consult with the Voyager crew since, aside from the Enterprise, they had more encounters with the Borg and even have a half-Borg crew member.