Strides of improvement? Kimbo's been training MMA for 3 years now, he's 35, and he barely managed to eek out a boring decision against a guy that the UFC cut and then re-signed as a hand-picked punching bag for Kimbo, perhaps the only person in the UFC with a worse ground game than Kimbo. The difference between Kimbo now and 3 years ago is minimal and I see no reason, marketing aside, for him to be anything better than an undercard fighter.
That said, I wouldn't be shocked if they milked this popularity cow for every last drop and put him up against someone else insanely popular. Loser of Couture/Coleman anyone?