My gut feeling is that the intent or motivation or whatsoever won't arrive from a single model but will be the result of several things: a frontier model for long reasoning sessions, some jev like models for more immediate actions, some improvements that will make the context rot less relevant, faster and more energy efficient models, a harness that coordinates everything.
Already today we can build some "fight or flight" mechanisms, and once you have done it the "intent" is not so far.