I think people are concerned about Pixate, as THAT is the tool they love. Google's vague plans for design tools in general is not necessarily any reassurance on the future of Pixate.

Given past experience, Google has work to do to build trust. Self congratulatory is probably not the best way to do that.

Pixate as an independent and innovative entity would have been exciting to watch and work with. Pixate as just another Google limb won't go its own way.

Try as it might, Google will never own design, though they may try to buy the best design products.