It already is the last little thing. I wish it, and all it's proponents well. Heck, I have a couple of 22s myself.
How many 7mm rifle rounds do we have on the market now? The 7x57, the 280/7mm Express Rem., the 7mm Rem. magnum, the 7mm/08, the 7mm Weatherby, the short fat 7mm magnum, and the even shorter even fatter 7mm magnum? The people who make guns and ammo are trying to find ways to sell more of both. More power to them. But I don't need one. But, if they came out with a 44 Grand Magnum, that would still shoot regular 44 Magnum, and 44 Special, and didn't look ridiculous in a Ruger Blackhawk configuration, now I would have to have one of those. That would be practical as all get out.