Honestly, as fun as BiS was, I still think it had a similar feel to Dream Team that wasn't that great, but I think it was DT's final boss that really did it. They started feeling kind of...samey? Ironic that one series became almost obsessed with experimentation while one seemed almost obsessed with the old even if they did add a few gimmicks here and there.
Though, expecting the Paper Mario side of Paper Jam to be chalked full of old partners and stuff does seem a bit of a stretch. Honestly, I think that's the one that would most deserve a Bowser final boss since you get two double teaming them. Just, uh, maybe in a different way than they handled it.
I don't hate new Paper Mario, but I am somewhat critical of Miyamoto, and not just because of his stance on Mario. His meddling with Star Fox and F-Zero are also...questionable.
New Super Sluggers?