Bradley Chambers on why Apple doesn't need to buy into something like the Nest:
"What was in the center of the display? An iPhone. What is on one of the trailing images on Nest's homepage? It's an iPhone. What's on D-Link's advertisement for their WiFi enabled cameras? It's an iPhone. Are you seeing the trend here? Apple is already at the center of the "Connected Home". Just about every modern "Connected Home" device is setup and managed with an iPhone."
He continues with another reasoned inference:
"It's not currently a product category that seems like it's ripe for disruption and expansion. If it changes in a few years, then Apple can enter the market at anytime."
It wouldn't the first time that Apple entered a market and changed ("revolutionized") it.