I don't think Kartel's career is "Dying" because of Mavado. I think he is just losing his "novelty" quality and has to work harder to come up with fresh styles and concepts to compete with the newer artists, and those who started out at the same time, that are making waves (i.e. Mavado, Busy Signal, Bugle etc.) because I remember at first EVERYTHING Kartel dropped was turning to gold just like Vado.
He's doing well in terms of success as an artist still but I think leaving the Alliance and starting that Empire nonsense was the worst career move he ever made. Trying to be like Bounty without any serious artists to back you but Aidonia (force to be reckoned with still) and MAYBE Deva Bratt (Di rest a dem have to prove themselves still). Di yute intellect still and his lyrics and delivery are top notch so Kartel nah go no weh for a long time to how mi see it...