So someone comes up with a body armor that will possibly defeat the 556. Now, with a little extra, they can make a body armor that will defeat the new round.
They've been tweaking the old Colt A1 & A2 since the 60s until its about as dead nuts reliable as a carbine can be. The M4 is super accurate, super reliable, super easy to maintain, super easy to train on, super portable, good out to a little over 300 yard, and easy to feed, with 30, not 20 round magazines.
Lets replace it. We'll make millions.
But thats not to say theres nuthin better. This new rifle could be it. Maybe?
I'm old enough to remember when they replaced the M14 with the M16. The complaining was loud and long. Now, several decades later, they think they have a superior rifle to the M4 built on what appears to be the same basic platform.
I don't know anything about the author of the article, so maybe he knows what he's talking about, or not.
I personally want the soldiers to have the very best rifle available. Maybe this new rifle is it. Maybe?