I would love to short Waymo. And now that Sergei is no longer there to shield it from Ruth Porat - who is well known for hating risky bets - I don't see a bright future for the company. And working conditions there have already deteriorated to the point where most talented people don't stay (just check glassdoor reviews if you don't believe me).
I'm pretty sure Larry and Sergei wanted their legacy to be Waymo. I'm pretty sure Ruth Porat wants her legacy to be killing Waymo.
Both Larry and Sergei are still on the board, so I don't see what changed? If you are thinking along that route, wouldn't it be more important what Sundar Pichai's opinion on Waymo is?
The screws are definitely going to tighten, moreso than they already have. The majority of the original talent that made up Waymo left years ago - that doesn't happen when you're on the brink of an actual breakthrough that can truly transform the world for the better. If Waymo can't pull a rabbit out of its hat, it's going to the Google graveyard. This isn't going to play out immediately, it will take a few years.