Only issue I see as to the possibility of 40 S&W being plentiful on the used gun market is price of ammo. JMO if you are shooting + P 9 mm you are so close to 40 S&W barely a difference in recoil.
NRA Life Member, NRA Range Safety Officer, NRA Certified Pistol Instructor, IDPA Safety Officer, USPSA NROI Range Officer,
ICORE Range Officer
As you are, I once was, As I am, You will be.