Welcome Ruger480 to the forum.
Ruger totally 'missed the boat' with the 480. It kicks too hard for use in a double action frame for most men to enjoy.
If Ruger missed the boat, it was in not marketing it sufficiently back when it was introduced. It does kick. I think it kicks a lot, but that is me. Many people like a DA revolver over a single action. Whether the recoil impulse would be more manageable in a single action frame is another matter.
You have to want to shoot these big bore revolvers. They are not for everyone and I don't think they were ever envisioned as a revolver for everyone. They knew it was essentially a hunting revolver and as such they chose to make it in the 7.5" and 9.5" barrel lengths. I have a 9.5". It is quite the hawg to carry, but manageble in a shoulder type holster.
The 480 Ruger is all you need for hunting whitetails or any North American game that you can get close enough to make a fair shot.
As far as a Ruger single action goes... You can get the 480/475 in the Magnum Research BFR in 6.5" and 7.5". It is not a bisley frame however. It is a well made revolver and I would call it a Ruger+. They pay a bit more attention to detail than Ruger.
Since Ruger is making both the Alaskan and the 7.5" SRH, I think there will be a sufficient supply to meet the demand since it was discontinued. I would like to see them make a 5.5" or 6.5" SRH. It would be a lot handier in the woods. I think the SRH is a better revolver than the Redhawk.
There would certainly be interest in a Ruger manufactured a 5-shot single action using the Bisley frame. But for now, I am pleased that Ruger has at least started making a few production runs of the SRH. They are not inexpensive however.
Added: I want to get an Alaskan in 480 Ruger. If I see one at a shop, I will probably take it home with me if the price is half way fair.