Exports are based on technoligical allowences of the platform.
PS4, Sony has shown as far as I know any interest yet in Borwser Apps with a robust enough browser base(I could be wrong)
XBOne, MS has interest in a universal app. This seems that at some point Construct games will go to XBoxOne platform.
Ouya,you can use CocoonJS or Intel XDK. I think even down the road there might be support for webapps. But more proof of webapps on the Ouya will help convince them to implement Lolipop webapps.