Humans have political power because of our ability to enact violence, same as it ever was. Until the military is fully automated and theres a terminator on every corner that remains true. Even then there are more than enough armed americans to enact a guerilla campaign.

> "don't tax us 95% of our profits, tax us 10% or we'll switch off all of our services for a few months and let everyone starve – also, if you do this we'll make you all wealthy beyond you're wildest dreams".

What does a government in this situation actually do?

Nationalizes the company under the threat of violence.

> Once the government is generating the vast majority of wealth in the society, why would they continue to care about your vote?

Because of the 100 million gun owners in this country? I find it incredibly hard to believe people as a whole will lose political power because of their incredible ability to enact violence in the face of decreasing quality of life.