A union doesn’t change the fact that voice actors are expendable. You can make a movie without hiring any voice actors. That’s a fact.
And hard bargaining by the union is likely accelerating the adoption of AI. The technology is immature right now and not really good enough… but it’s getting better and in part because of all the strikes it’s getting better really fast.
Taking away all of the actors is a really powerful motivator for Hollywood to start making movies without actors.
At the end of the day, it’s the producers who are the moneybags of the industry. All the money comes from them. If actors don’t have a good relationship with producers, then actors will not get paid. That’s got nothing to do with AI - producers can (and often do) choose to invest their money in something other than the arts.