the actual voice actors creating that voice will be paid out residuals for the duration of voice generation
In a perfect world, sure. In reality, we've seen that paying residuals is something companies won't do if they can possibly help it. It's one of the very issues being fought over in the strike negotiations right now.
And given there's still going to be a few years as the tech improves with significant overlap of needing to work with actors to get performances right, this is all going to get managed in acceptable ways.
I admire your optimism, but I can't share it. We're so poorly prepared to deal with job losses associated with AI and automation in general, and I don't see any movement on that front. If you're relying on unions to get it done, know that they already have an uphill battle getting things they should've had years ago, let alone future protections against a rapidly changing market.