I mean up-to-our-eye-balls-can't-escape-them too many knives. If knives last forever, and we keep making knives, then some day eventually there will just be TOO many knives.
IMO you are more likely to lose it before you use it up.
My bet is that the knives we hoard will be sold off by our descendants at flea markets (or by the box online) and will be littered in nooks and crannies all across the land.