People didn't like phone trees, and phone trees have endured. AI might finally kill the phone tree.
The decrease in Indian call centers were mostly due to broadening offshoring destinations and increased emphasis on skill at sounding American. Some places did proudly declare their domestic call center status, but lots more anonymous but credible sounding call centers exist.
Here, the accent is whatever they want, the cost is closer to an automated phone tree than a human.... I think this one is persistent, though I will penalize companies that fob me off to LLM even if I have to pay a little more for the ones with actual human assistance. Of course, I almost never contact a company so I may be none the wiser. The only times I contact a company are almost always because I need their authority to make something happens rather than 'help', and the companies are not having the LLMs do anything but try to spew crap out of the knowledge base, and when nothing is there make up something instead, like the ability in the online self-help to do things that aren't allowed to the client.