Prices will literally have to go up by 1500x+ in the above scenario to make it cheaper for a human agent. I assure you that AWS is big losing money running Nova Lite 2 (the model I use for speed and low latency) with their own models running on their own custom chips.
I calculated the full cost of a call to be $0.05 cents a minute when handled by AI and that includes charges for a 1800 number and the varios other AWS services it uses.
Nova does the processing of the text after a separate voice to text service (Lex)