I am not sure what can be done about this, but from my point of view an effective measure would be if everyone is vigilant at closing such questions and even if they are not closed, did not answer questions with the homework tag (or those that should be tagged as homework) for at least 24 hours.
I will note that not all questions that have the homework-and-exercises tag should be closed. The tag also applies to valid PSE questions where a homework problem is the context. If the OP is clearly not asking for a solution and is really looking to understand physics concepts behind what is presented, the question should not be closed.
I will also say that I do agree that we should be vigilant during this time, but I also worry that this call to be vigilant will send the wrong message that once this is all over we can then be less vigilant and less strict with the homework policy. Ideally there really shouldn't be any difference in how things are approached compared to normal. An off-topic homework question is an off-topic homework question. I don't think the motivation behind the posting of such a question should be relevant.
So, thanks for the heads up, but I hope our adherence to the homework policies will be as strict as it should be during this time as much as it should be at any point in time. I also hope that we will not become less strict after this is all over.
At the same time, I do agree with the anticipation of more homework/exam questions being posted. The issue with users like me is that I pretty much run out of close votes every day, and most of my votes to go towards homework questions. Therefore, being more strict / more vigilant is not going to do anything for users like me.
So instead of a call to be stricter on the policy, I would think a better call / proposition would be to allow users to have more close votes during this time (or at least more close votes for the option of being off topic homework). This would then allow the site to take on the increased levels of homework questions. Unfortunately, I believe there would need to be ample evidence that there is actually an increase in the posting of off-topic homework questions and that this increase is overwhelming the closure process to where questions like these are not closed fast enough. Additionally, I am not sure how this would be implemented, as I think the rules on the number of close votes a user has is implemented across all SE sites. So, at the end of the day, this idea probably would not be able to be realized in a fast enough time to combat the problem, should it actually arise.