Accusing Google of slowing down the field is laughable. Google has opened up a ton of AI stuff, in every category imaginable, from Inception (pre-trained model), Street View House Numbers (giant dataset), gemmlowp (infrastructure for fast matrix multiplies), deep dream (implementation of a specific deep learning technique), all the way to TensorFlow (complete production-ready neural net framework with examples and a free graduate-level university course to go with it). And of course they're publishing open access papers for everything in addition to the code releases. Furthermore, they're also employing core contributors who continue to maintain important libraries like Ceres Solver, Eigen, and Keras, just to name a few.

Google has even open sourced DeepMind's previous most impressive achievment, the Atari player. Based on that track record it's probably only a matter of time before the Go player is released. I'd expect it not long after the upcoming match, if they win.