Skylanders Superchargers didn' t do that great on the WII U even with Bowser and Donkey Kong. Now they're focusing on PS4 with the Crash Bandicoot figure, but Superchargers did even worse on that system last year.
Maybe with the succes of Rachet & Clank on the PS4 owners of that system would like more cartoon violence, but most likely we are looking at the end of a franchise.