It appears to me that the people hording can only horde so much. After a few days, or a couple of weeks supplies should begin to return
A relative of mine could find a way to stuff the TARDIS to where it would barely standing room.
Those of us who saw it coming and stocked up already can sit back and wait a week for things to catch up. That was the point of stocking up.
One big thing Trump could do, is order DOT to relax overtime rules for truckers a little. Just enough that they can do 4 or 5 trips instead of 3 per day, for the next few days.