As far as Ilford products are concerned, there is no need to stock up as they are still (and looks like will be) a viable company for the long haul. A lot of things can happen in one year and longer. Both planned and unplanned. I might suggest scaling back your (film) disaster planning way back. Keep 6 months to a year worth and re-evaluate at the half way point.
That's what I do personally. I have what I think I'd spend in a year, film, chem, and paper wise. I do this for convenience.