Look realistically and as much as I hate to say it, but these snakes have lived together for over 3 years without major incident (or perhaps I missed you mentioning anything happening) so likely the short time until you can sort out their housing isn't likely to kill them. It's not a great situation and certainly not the recommended form of housing but unless you can divide the enclosure and provide the right heats and temps on both sides, you and your snake are rather stuck with what you have.

I assume you've always seperated them for feeding and so forth. If they are breeding age, different genders and have locked up, you best prepare for eggs.

This, by the way, is not any sort of support of communal housing for these snakes - I'm just being realistic here as best I can be in my advice to you. Likely your snakes have dominance behaviours and long term stress but if they've survived this long they likely will until spring break. However, at that time make it a priority to get them set up seperately. They deserve to thrive, not just survive.