Half of statistics are made up, so the saying goes. It's easy to make "credible and realistic" numbers if you understand confirmation bias. You want to believe in ChatGPT, so you see its numbers as credible and realistic, despite them not being so.
Also understand that we are in the beginnings of a hype cycle. There was a time when HN was exuberant about the potential for blockchain. I expect that our expectations for LLMs to be made realistic with time. I also believe that LLMs will provide value, unlike blockchain, so the hype cycle is probably closer to dotcom in how it plays out.
The plugin system will be interesting to see play out. It's sort of a hybrid system, using LLMs as an interface for intent while calling out to other systems for accurate retrieval. I'm curious how far it can be pushed, it's hard to see these things being able to interact and navigate all of the tools we have created. Too much variability and opaqueness.