You're confusing Samsung and Motorola. It's Samsung that has problems getting Android updates, not Google. Google's own devices always get the latest Android update by definition.
You're having a hard time with the divorce, I see. You're in total denial and looking at mommy and daddy and saying, "No!"
Both Google and Samsung need to move into hardware and software, respectively, for their next stage of growth to please shareholders. Wearable computers, like Google Glass, are hardware that Google already plans to sell itself. There's Nexus 7 and Chromebook, too. Google sees a hardware + software future. Why not? Apple got the biggest market cap from that formula.
For Samsung's part, Samsung is currently building a 400,000 square foot megaplex just a few minutes' walk from Google headquarters in Mountain View. What's the purpose of this megastructure? It's not hardware but software! Samsung's poaching workers from Google for Tizen.