I'm confused, is your concern that enough Waymos shut themselves down on a one way road, at the same intersection, so as to block the intersection? Yes, I could see that as being a concern. I suspect it would be reported almost immediately, and would be at the top of the list of for the folks at Waymo to address. The cars weren't abandoned. They eventually moved. Though, I suspect they had to be manually driven (virtually or otherwise), out of the way. I can see how this could be a problem, but considering it would likely be at the top of the list of problems for Waymo -- again, during an emergency -- that I suspect it's not a serious concern in the long run.

Would I preferred that they had a light turn on that was flashing "An unknown emergency is occurring, please park me"? Yes, I think that would be a better solution. I would have preferred better performance from Waymo. My entire point here is that I'm happy that in my neighborhood, the Waymos were acting in a fail-safe manner, rather than just winging it.