The problem with Google's robotics acquisitions was that they fired Andy Rubin less than a year after he made them. They floundered after that.
It's clear that Google's management simply didn't have the patience to continue putting money into hardware development before the software was ready. They forced premature commercialization on BD and then dumped them on SoftBank. Strong top-level executive support could have changed that. I wonder what Google robotics could have been.