I'd be very surprised if it happened. JR's loyalty remember plus a year still on his deal plus if he were outright "fired" (without the medical "excuse") it makes Hahn and Kenny look bad, they vouched for him countless times, they hired him. Saving face is important in the organization remember unfortunately.
He should not be the manager when they are good...but if this organization wouldn't fire Ventura after all the goofiness, if it took two years of Ozzie complaining about his contract and mailing it in before they agreed to let him go, they actually extended the doofus Terry Bevington...they won't unload Ricky.