That's like a buggy whip manufacturer complaining in 1900 that autos would take away his livelihood. True, but the alternative is what, to put artificial brakes on technology? And if the voices are completely synthetic, then no one's voice is being used.
Pretty much! AI will eventually obsolete all of us. Voice actors and artists are just the first in line. I for one welcome this development, the only thing we need to do is ensure that people are still taken care of even if they don't have a specific trade in life.