I don't think that opinions will necessarily change even if NATO decides to use a new rifle. Even if the US and NATO eventually adopt the Sig XM7 in 6.8x51mm, AR-15s will still be cheap, ammo plentiful, and they'll all still be on the same standard. (Plus, the 6.8x51mm cartridge is a real barrel burner; if you're a higher volume shooter, you'll get maybe 5000 rounds out of it before accuracy is shot--pardon the pun--to hell.) But, we'll see. So far the design has stuck around and been refined for over 50 years. Hell, people still use the 1911, and that's over 100 years old.
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