I don't want any more level systems. Simply because Universe already goes to 50, near-unconquerable with every Skylander.
It's better to have something to strive for with each figure instead of being able to go from Level 1 to 15 in an afternoon and say "Well, you're maxxed out until the next game."
Not like the levels really MEAN anything other than a few more HP. I'd much rather have the levels go to 100 and know it might take years to get everyone that way. Although for the "completionists" out there, that would probably drive them nuts, because they'd feel obligated to get every figure they owned that high.