At the end of the day, I think that if forced pretty much every company, except maybe John Deere, would have to opt for the "blue" market and cut the red loose. What impact does that have? Is it unavoidable that it will come to that? What happens to national network advertising, do we have to reduce all ad purchases to regional runs? What happens to companies that already have gigantic investment in both markets?
I don't think any company has to opt for the blue market. For one, if some companies go for the blue market, there will be openings for their competitors to go for the red market. Sure it might be a smaller market, but with the right marketing a company might be able to sell at prices that wouldn't be competitive in the blue market. Actually, it is not so much companies that have to decide, but brands. A company can have two brands, one for the red market and one for the blue market. That way, they would lose a bit of the efficiency because they need multiple campaigns, but those campaigns might be much more effective. Some people might notice, but a bit of indirection in the ownership structure can go a long way to minimize the number of people who will know and care.
And at least for the moment, I don't think that companies have to choose if they don't want to. After all, Nike didn't have to make a controversial campaign.