also would like to see a Desert Eagle in .480 Ruger, not much different than .50 AE except rimmed case and a little wider but same OAL
I don't think you are going to see a .480 Ruger Desert Eagle. The limiting factor isn't just the length, although that is also a limiting factor, but the rim size.
The 50AE was created with a rebated head, to keep the diameter of the head the same as the .44 Mag rim. Now that may have been done so they didn't have to make a new bolt, and so swapping between .50 AE and .44 Mag is as easy as possible, but it is also possible that you can fit a larger diameter bolt face in the Desert Eagle and maintain sufficient margin of strength.
Right now, the potential market (assuming you could fit it in the gun) is pretty small.