I don't really know how you can make this prediction and be taken seriously to be honest.
Either you think it's the natural result of the current LLM products, in which case a decade looks way too long.
Or you think it requires a leap of design in which case it's kind of an unknown when we get to that point and '10 to 20 years' is probably just drawn from the same timeframe as the 'fusion as a viable source of electricity' predictions - i.e. vague guesswork.