Demand is not unlimited, even now. I have no demand for more paper products, and I have what wouldn't last a typical family even a week. I use sponges to clean up liquids, newspaper to drain bacon, etc. etc., and tp
Indeed there'll be —and is now—a temporary bulge in demand as the panic buyers and hoarders fill their coffers. The supply chain got choked in many places, and it'll take a month or two to recover.
But, after the bulge, actual use of tp will go back to normal. Maybe there'll be a slight drop off as some use fewer tissues per "session". Maybe some will increase their use to mark the end of the disruption. The increase in production will have taken care of the hoarders.