I do not know who said it but with a bit of luck this panic buying will wash out of the system in, hopefully, a few weeks. People cannot possibly get through what they have already bought in that time (or perishables will have been thrown out, milk down the drain) so when they go again they will not have the cupboard or freezer space and will behave more like normal. I can wait them out for a while.
The problem is that there is no 'User Guide' for this particular virus.
That has led to different places using modelling of other virus behaviour(s) given their own data or shared data or a mix of all or any. The only certain thing is that nobody knows which one is right and we won't know till it's over.