Basically, everyone wants Magpul to do things their way, but no one wants to consider what responsibilities they have.
Magpul is in the business to sell mags, and big contract customers are their business. That means the US Government, Great Britain, and Mid East buyers - like the ones getting the new six.eight AR's with the enlarged mag well. The Brits were a 1 million unit deal. So were the Marines.
Those contracts have penalty clauses for non performance, the company has employees who need paychecks, and the soldiers and LEO's who use the magazines will be literally saving peoples lives with them. But, for some, the political value of a boycott seems to be more important.
Magpul is responding to things like an adult, and not understanding the full picture seems to be the real issue. There's no "not selling mags to ban states" option for them. It's exactly what they do for business, unlike other companies who are largely dependent on public sales. It's why we haven't seen similar pronouncements from Glock, SIG, HK, etc.
It doesn't mean they aren't concerned or care. But, unlike the NY law which didn't exempt LEO's, they understand that things handled with a view of the long term is what will fix the current problem. They understand it's not going to be easy - they really don't have to move from CO, but they are willing to shoulder the expense and do it anyway.
If you were an employee there and just heard the announcement your job was moving hundreds of miles away from family, friends, schools, and resident hunting tags, how would you feel about it?
What I see is yet another example of the overzealous expectation that Magpul do everything in it's power to satisfy the whims of a few consumers. It's why they don't announce ship dates on new products, and after this, I can easily see them not making any public announcements about when and where they might move. Their fans are actually more problem than their enemies - we all understand where the gun banners are coming from and what they propose, the fanboys, who knows what will tick them off and start another heel kicking fit?