[Perfectlap]

I'm going to bet that Google is going to aggressively push to have these already installed in TV's from the factory. If this simple device with two HDMI pins, a wall charger and the device itself can be sold for $35 then mass producing them as part of TV hardware should be peanuts.
getting people to connect their smartphones and tablets to the TV at home this effortlessly is going to be a HUGE threat to the cable companies and a pretty much change how people watch TV/see advertising.

Apple will no doubt try and do the same with TV makers as a way to mitigate errosion of Apple TV use, but if they try and dictate any terms not to the manufacturers liking, the LG's, Panasonics, Sony's and LOL Samsungs can tell Apple to pound sand because the Google version will always be available to both Apple and Android users alike. Unless Apple try to block the signal somehow from their devices.

Leaving this sort of thing to Google should free up some margin for the TV makers who don't really have a big interest in getting everyone to use their version of smart TV software which probably requires constant updating.

p.s.
They've already hacked the Chromecast to allow it to beam video games from your tablet to the TV. All of those gaming companies are probably frantically coming up with plans to get ahead of this. All of those free apps in the Apple Store and Google Play could put a serious dent in gaming sales.