> The more AI causes productivity increases, the less and less number of workers will be needed.

That only holds if companies have a fixed need for "productivity" which is met by their current employees, such that their employees becoming more productive means they need less of them.

Every company I've ever worked for has wanted to achieve way more than they are able to get done with current resources.

But generally yes, the biggest open question about all of this is how the impact will play out on the economy, job opportunities etc. I've not seen anyone come close to a confident prediction about how this will play out.