I am hopeful that more people will request openness by simply starting up a chat here: http://www.linksys.com/us/support-article?articleNum=155192
(scroll to the bottom of the link's page and click "Start Live Chat" and then select the "Home Product Chat" button.)
The rep who helped seemed responsive. I told him Linksys will make more money cause more people will buy with open drivers. In my request I sent the link to Felix Fietkau's video: https://www.youtube.com/watch?v=hiUosbhR0Wo
Maybe if enough people request it, the mwlwifi can be the next ath9k driver. This would be good because the wrt1900acs and wrt3200acm offer more powerful hardware than what can generally be found in openwrt/lede compatible devices. And Linksys is marketing their product as "Open-source ready."