The most probable outcome, going by the show overral theme, how Genndy handles time travel on previous works, how most time travels work on cartoon and comics, and going by the rigic morality system of the show, and the finale with the beautiful landscae full of trees is that:>Future is bright and hopeful, instead of small pockets of resistance and beauty (lonely tree), it is peaceful and great (forest at the end, as Jack smile at it)>Likely, most characters have happy lives in a better future. Scotman could be an olympic athlete or something, while Scaramouche is an idol. Other examples of shows doing that would include: Justice League Unlimited, Mystery Inc and Jack Chan show, as well as Dexter Laboratory. >Even the ladybug is a good sign, because on Japanese tradition, ladybugs symbolise "separated lovers that will see each other again".
But Genndy choose to left it more ambiguous, because he probably WANTED people to keep talking about the finale - he even said it on an interview. So the arguing is intentional.
The real question is:
What kind of profission life do you think that the previous characters have in the Akuless future?