I chair the working group on physician-hastened death. This is something that we have discussed. One of the things that you might consider is to say something like, “for patients entering the last year of their life as best we know”. The protection that can be put in there is a proportional waiting period. For example, if somebody is clearly dying within days to weeks, then 15 days may not be reasonable. If somebody has maybe a year, maybe longer, maybe there should be a longer cooling-off period. That is a way to balance it and offer some sort of protection.
Among my colleagues, not only palliative my care colleagues, “reasonably foreseeable“ does not have a medical meaning, because it is reasonably foreseeable that we will all die. It's too vague.