I think they'll all still be used. In reality ask about John Moses Browning... his gun design is still fundamentally the same over a century later. The AK has only been around since 1947. And the glock is relatively recent compared to the others. As far as glock goes I believe they'll always be known as the easiest, cleanest, least maintenance polymer out there. Its reliability will always be remembered. But there are other polymers already out shining the glock in terms of reliability and accuracy. However there has yet to be a rifle that has the AK's rugged durability. And the 1911 is just an American icon.