It is an interesting intellectual exercise but not something that I would worry much about.
Since we are being intellectual . I could live my whole life with .22 LR, 9mm and 12 gauge. .308 as a fourth option.
As I have said before, every good American should own an AR-15 in .556 with a pile of magazines. I could live my life without one of those however. But in the interest of keeping the peace I own one.