The only time you need to shoot a man 14 times is if 13 didn't stop him. If he's hopped up on stuff (the new one is bath salts) its entirely possible you might need all those. Especially if you miss or get non-critical hits, and the hits to COM aren't hitting something that will stop him immediately. Technically, one shot from #1 buck will be hitting a man 16 times. If you're in a situation where you have to explain why you shot him that 14th time, your defense could be "he hadn't stopped attacking yet." Simple as that. There are stories of people hopped up on drugs who were taken down by LE/M and took several hits to the chest before finally being brought down.
And all those stupid teachers taught me that the manufacturers build things BECAUSE the public buys them. Even Ruger finally figured that out and started making 1911's and AR15's. You really believe that if all the manufacturer's started making Highpoint style pistols (blowbacks) then that would create a bigger demand for them????
Like I said, it's in a state of flux. Some people will buy the 5-7 anyway because they really want it, others flat-out refuse to because they want to stick with their current caliber of choice. However, there are a lot of people who would buy it if:
- Ammo was cheaper and more available
- There were guns in the $500-700 price range instead of over a grand
- There were guns that fit what they're looking for (i.e. all of my semi-auto handguns are DAO with no safety or Striker-Fired with a trigger safety and no manual safety, the FN FiveseveN is single action with a manual safety).
- There were guns made by someone who the buyer has brand loyalty for (i.e. some people won't get anything but a Glock)
The problem is, because of those limitations in availability, a lot of the fencers are reluctant to buy one. If those limitations were gone, then more people would buy the 5.7 platform. The problem arises in that manufacturers don't see the platform as popular, so they don't make a frame for it. This leads to the monopoly of the 5.7 by FN, and continues the availability issue.
That's why it's up to the manufacturers. If Glock decided to make the G40, in 5.7x28mm with a 5" barrel and 20-round capacity, maybe MSRP $650-700 (in stores for $500-600), I'm sure the popularity of the 5.7x28mm would jump overnight. Glock making that leap of faith to produce the G40 would provide customers with:
-Assurance that the 5.7x28mm is a platform considered useful by more than just FN and a few random no-name-brand companies
-An option other than the FiveseveN, which is more affordable and has different characteristics that may be closer to what they want
So yes, the low supply AND demand are tied to each other, and its going to take a manufacturer to break it.