I just read every sask reg I can find and I'm still pretty sure only sask residents can hunt mulies.
More general ranting, a history lesson, and a prediction. (It's a slow morning)
There are some zones that have more antlerless mulie tags than applicants. These are offered to Saskatchewan residents over the counter and after a certain date Canadian residents can buy whats left over. At first glance that may seem fair enough, but some view it as a step toward more and more non-resident hunting. The outfitters organization also wants to start guiding big-game in the south where they are not allowed now, and for more species too. Many locals are livid about that.
Just like gun-control nibbles away at rights, we are concerned that our game-department is slowly giving away our hunting opportunities for a couple of dollars. Some don't want to give that first inch, least they take a mile.
I would be less bitter about non-resident hunting if the other provinces would allow us to go there. That isn't going to happen. Whitetail may be common here, but they are also the best hunting we have, and maybe the best trophy whitetail hunting there is. I don't see any other provinces saying "This is our best, come and take it".
The South East corner of the province which I just happen to be working in right now is an interesting case. Decades ago (40s?) Americans used to be able to come up and hunt, and likely thinking that the whole world works like at home started leasing hunting rights for deer in an area that is fantastic, closer, and relatively open country that can be easier for some to hunt compared to the big bush up north. When those down to earth, pragmatic country boys got up one fall morning and saw "no hunting" signs where they used to go hunting because someone had more money than them the #### hit the fan. By the time the dust had settled Americans could only hunt in the north which is almost all crown land that can't be leased, and then only with guides. Leasing hunting rights is flat out illegal as well. A law was made that absolutely no outfitting can be done on posted land, because that would be a back-door way of leasing the same hunting rights. The rest of the province followed suit. The non-resident Canadians being able to hunt in Saskatchewan was primarily so those that left home for work could still come home and hunt with Dad and the family. Nobody ever thought that a Canadian would travel any distance to shoot a jumper if he didn't have a personal link to the area, but that has changed now. Look for the loophole to close as well. Besides, the guys can work rigs at home so why move away?
If I had to guess why South-east Saskatchewan isn't following this "let everyone with a pulse go hunting plan" that SERM cooked up it's because they went through this bull#### before most of us were born, and found the cure. They don't want to let SERM or anyone else screw up their hunting for them for any reason, new or old. If history repeats itself the idea will spread throughout the province. If the outfitters and SERM trying to make payroll have their way things will get ugly.