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My guess is cost, like everyone else. Unlike the other cost reasons, I'll go a step further and say it never caught on quick enough and wide enough in PD/military applications for the ammo to be mass produced and surplused, nor did offduty/retired folks pick one up after they processed out. What sidearm does the US Military issue? The 92FS. 9mm. What's the cheapest centerfire handgun round? The M4 is chambered for what? And what did I just pick up a case of a 6.49 a box? Well technically that was .223, not 5.56 but still....
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