I would say this isn't about a niche product or even a thermostat. This is a very telling acquisition because it tells us 2 things:
1) Google wants to enter the home automation industry, and
2) Apple apparently does not, or at least they aren't serious about it.
Apple could have taken a huge leap forward in developing their home automation market here, but instead they want to focus on acquiring small GIS & social media companies. Hey Apple, it's 2014, not 2008.
Actually Apple is acquiring a lot. They acquired several hardware companies, such as the one which produced the Kinect sensors in XBox. That means they are seriously looking into motion control. They are simply more careful with their money than Google apparently.