I don't think we will ever see free ranging herds of millions across the plains, but considering the articles I posted above I think that you could easily add a ton of small herds across the west. Maybe as many as 10-20k. If a herd of 300 cows can run around, there is no reason in my mind that they shouldn't be replaced with bison. Can one really argue those cows, couldn't just as easily down fences, contract brucellosis from elk and then transmit them to other herds?
Cow are generally vaccinated against the disease, and if they test positive, then they're culled. They're controlled far more easily than wildlife.
Right now, the known transmission vector is elk to livestock, because those populations around YNP are heavily infected due to how they are managed on wintering lands and the concentration of elk rather than having them dispersed on natural winter range.
You manage brucellosis by managing livestock. it's the easiest component to viably do so with. Which is frustrating for livestock producers who watch infected elk run all over calving grounds unless they work with FWP on hazing and other efforts.
My ideal for restoration would take probably another 20 years to get to consensus, but it would involve the CMR and APR in conjunction, as well as buyin from locals who show up to work on stuff, not throw bombs. Tribal conservation efforts deserve a ton of support and attention as well. There are few entities out there doing as much for restoration as tribes. With the translocation of brucellosis negative animals out of quarantine and to tribal conservation herds, I think that's a program that needs more funding & help to increase the flow of animals to places where they are welcome, and that have been proven to be brucellosis negative. Expanding tolerance on the north and west sides of YNP would be good as well, especially for the huntable population in YNP. Giving them more room in the winter, and then staggering hunting zones to allow animals to move outside of the park without facing the firing line would do more to control that herd than test & slaughter, IMO, and it would provide the pressure release valve on the cull that is needed.
In other states, I can see expanding current populations and doing some unique co-management plans with tribal agencies so as to share landscapes in order to help find areas of little or no conflict.
In any scenario, landowners will have to be at the table and taken seriously or nothing will occur.