IF google would make it part of their rankings it doesn't matter if you could be sued or not - you will make sure you are accessible to avoid being not found.

I wonder if google can be sued for not making it part of the ranking thus misleading blind users... Interesting angle for a lawyer. I hope someone at google is reading this and mitigates that risk.

You'd be surprised. In Florida, there have been cases which have set precedent as websites being similar to libraries, which would mean the ADA applies to purely digital places. The problem is that the ADA has never set explicit rules for website accessibility.