If this type of stuff were perfected and was able to meet customer expectations it would be available on $75K+ automobiles as an OE option. I bet we will see it in the next few years, but it will be a while before we see it in the sub $50K price point. I'm sure the price of replacement glass will be pricy.
I just made an appointment to get my tint done. The 3rd brake light was in the trunk lid spoiler on my 13, with an unused dummy light under the window above the package tray. My tint guy dropped the tray and tinted the whole back window, some lazy tinters will tint around the unused third brake light. it looks much cleaner to tint over it.
That said since my 15 only has the third brake light in the package tray I think I might have him tint over it anyhow. The look will be much cleaner and I am sure the light will still show through the tint. What have you guys done? How about positing pics of the rear window 14-15 tint?