The answer to this seems obvious: continuous training of live models. No more "cutoff dates": have a process to continually ingest new information and update weights in existing models, to push out a new version every week.

Note that I said "obvious", not "easy", because it certainly isn't. In fact it's basically an unsolved problem, and probably a fiendishly difficult one. It may involve more consensus-based approaches like mixture of experts where you cycle out older experts, things like that -- there are dozens of large problems to tackle with it. But if you want to solve this, that's where you should be looking.