How quaint. It's a joke, I get it.
On the serious side, the biggest problem with adding voice actors now isn't the cost for DC, but the fact that people have already head-canoned what they think each character sounds like. Now imagine the actors voices not even being near each player's preconceived ideas on what THEY think Debbie and Diane and Jenny and... And.. and.. sound like.
It's different when a developer starts voice actors early on. Players are then conditioned on what each character sounds like. Even if they have to change voice actors, they can look for those who have similar vocal tone and timber.