Anyway, there are way too many questions unanswered. You don't leave a show with too many questions unanswered.
I do think though that they should really put some thought in season 5. The supercomputer is shut down, xana's destroyed (NO!!!!

But it is puzzling with ep 95. Usually they leave with a huge cliff hanger on the last ep. Season 1 was that Aelita didn't make it out of the supercomputer (What was the point of that? I mean, thats what they fought for, and then they lost?). Season 2 was that Aelita made it out. Season 3 was that they brought William on the team. Season 4 left with the above said. But they left with the gang saying goodbye. Watch the last minute. It wasn't a "lets walk off into the sunset", it was "seeya".