It’s already relatively simple to make a customized chat bot tweaked on personal data to have focused conversations. Once the tools are ironed out and simplified, it’s definitely going to be possible. I’m just not sure the demand will be there.
These things will be insanely useful as they improve. I've always found Google's assistant fairly useful, even just answering basic searchable questions and performing basic tasks. The LLMs that are available now have a way better grasp on natural language and thus a much better ability ability to comply with your requests.
The ability to talk to your home assistant like you would a secretary instead of a computer will be a game changer. There comes a point for (almost) everyone where convenience and utility will outweigh the privacy concerns and inertia required to get started. I think having a personal secretary that has a great understanding of your commands and an understanding of your needs and the ability to interact with your online services for you in complex ways is going to check that box.