They do have quite a few options for residents of bordering states already. As you probably know, UW participates in WUE - this gives discounts to students from most of the western United States. They also now offer a "Good Neighbor Discount" to all bordering states. While it certainly helps, it still leaves about $12-13k in uncovered tuition for out-of-state residents. Room and board is required for freshman and is an additional $14k. So about $27k per year even with the Good Neighbor Discount.Just give residents of bordering states 1.5 or 2 times in-state tuition. Would probably see a thousand or more matriculate on that discount alone.
If you are not a resident of a nearby state, you are pretty much screwed. Tuition plus room and board at full cost is $36k per year. My daughter, who is very strong academically (99% percentile for both SAT and GPA), was offered a grand total of $12k in scholarships at UW. This still leaves us $24k per year to cover. Baylor University ($77k/year total cost of attendance) offered her so much more in scholarships that it will actually be cheaper for her to attend there then it would be to attend UW.