First of all, it will make cold calling way, way worse. Time to ramp up restrictions, fines and other penalties for that kind of stuff.

When it comes to tech support call centers, some may actually improve. Not because the technology is so superior, but just because the current support simply sucks, and any change would be an improvement. And then they must actually work, i.e. solve the customers problems. On top of that, there is that case where an AI call center made expensive promises (IIRC if promised a car for $1 or something like that), and the judge made the company uphold this deal.