re: What rifle/pistol round got most popular the fastest?

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sus·tain (s-stn) tr.v. sus·tained, sus·tain·ing, sus·tains 1. To keep in existence; maintain. 2. To supply with necessities or nourishment; provide for. 3. To support from below; keep from falling or sinking; prop. 4. To support the spirits, vitality, or resolution of; encourage.

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No where in that definition does it say that it has to fill a void. What void does the 17 fill while we're at it?
Sustainability has to do with the 20 other calibers that use a 30 Cal bullet and the billions of 5.56 brass already in existence. Unless you expect the 30 Cal market to dry up, 300BLK will be here for a long time. Tell me, when the 17 flavor is over and no more ammo is on the shelves, how do you plan on shooting your rifle? You handload rim fire?

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Average Joe's just don't go shoot up a lot of centerfire ammo out of $1000 dollar army guns.

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Well, that's just not true, because they do. It also comes in a bolt action and a single shot in case you cannot afford it.