the Federation would probably eventually start falling apart. It is so huge, planets would disagree with others and start leaving the Federation. What's the other alternative, the entire universe belonging to the Federation?

. I'd rather see a decrease rather than an increase for the future. So, I'd prefer a darker image that DS9 gave. Things can't always be wine and roses. I loved hearing the idea that in the future, even the planet Vulcan would leave the Federation.
But, this all would be temporary if the story took place 150 years after Nemesis since we saw that there still was a Federation in the 31st century (Daniels on ENT). I wonder how different the 31st century Federation would be from the 24th, I'm sure a lot would be different.