Unflavored nic
juice should store well for a minimum of two years and most likely much longer if stored properly. What happens when one runs out is a matter of personal choice and/or dependent upon whats happening at that time. Some people plan to use the time that they do have a nic supply to wean themselves to 0 nic and eventually off
vaping. Others might use that time to find other sorces of nic to be able to continue to vape.
Honestly unless the fear becomes a reality I think its extremely difficult for most people to know exactly what they will do if they find themselves without a supply of nic but my bet is many would actually return to smoking no matter how much they hope not to.