If I could harness both the near limitless knowledge of the internet and somehow filter it through my needs that could be used to train my assistant ( and I worry that Black Mirror already did an episode on that that was a little too direct ), I think that could be a viable product and I would consider buying. Naturally, I would need to feed it my thought patterns/writings and so on ( and then hope they actually reflect my reality ). Not exactly an easy task.
That said, it is a fascinating thing to think about.
My thought conclusion was that the assistant needs to know or learn my intentions.
From that it can actually pre-empt questions I might ask and already be making decisions on the answers.
Now what would that do to our productivity!