What we really need to do is get rid of the 30-06, .270, 30-30, 7mm, .223, 300 Win Mag, 338 Win Mag, 375 H&H mag, 9mm Luger, 45ACP, 38 special, 44 magnum, and 357 magnum.
That way we could see what rises to the top in the next generation of cartridges and it will give the gun writers a reason to exist, at least for a little while.
Or better yet, keep them all and then continue the practice of developing thousands of nearly identical American big game cartridges. We need to fill in all the niches, and after we're done with the .308's, .309's, .310's , and .311s, we can do the .3081's, .3082s, .3083s, etc.