Even if Google fails to play nicely with Microsoft and Apple (who are both well known for their enthusiastic embrace of open and royalty free formats) it's still a fact that Android accounts for more than half of "smart connected device" sales (i.e. phones + tablets + desktops + laptops) and is growing that share rapidly.

Having VP8/9 support shipping on those devices is a major (though probably not fatal) blow to H.264 and 5 and will probably weigh heavily on the minds of the people currently figuring out how much they can charge for H.265 patents.

Though personally I think H.264 (particularly x264) being "good enough" and massively deployed might be a bigger issue for H.265 uptake.