Never happen, at least not for a few more decades. Most of the birds we have may have been designed 40 years ago but I can assure you, they are practically brand new. This LB can be deployed by many means, cargo aircraft, flatbed, or even a toy hauler, and it can do things no other platform can do. Until we stop having a need for hostage recue, and hi-value target acquisition we will keep flying these things.
BTW, I didn't/don't fly these, but have ridden the pods and have had side seat experience (thanks to a great CO), but my main job was providing fuel and ammo to them near their objective because they are still unable to be aerial refueled, unlike our other birds.