This list will absolutely be geo-dependent, which means it will be quite different overseas....
But as you stated it's an American centric article, so my remarks may not be fully relevant, then....
It's claimed elsewhere that Fisher were the ones inventing the dome tweeter and not AR, is that correct?... but AR then were the first to use it commercially on a large scale...
But I don't understand how you could miss Quad Electrostats, DCM Time Window, Vandersteen Model 1 .... Duntech's also made raging waves, but probably not so much in the US .... Also Joachim Gerhard made a revolution in Europe with the original Audio Physic Virgo. In the hi-end arena, Audio Physic is always there ...... But I guess the Virgo never made it to the US.
Dynaudio Consequence has been sold, more or less unchanged since 1984, Consequence Ultimate Edition replaced the original version a few years ago, but that a statement product of a hi end manufacturer is almost unchanged for more than 30 years is some influential indeed ....
Miller & Kreisel is absent, well..... As I understand, they were the guys that invented subwoofers, how can anything be more influential than that?
Also agree about KEF, they influenced speaker industry at large IMHO
And also about Bang & Olufsen, they were major player on speakers if you go back some years, but probably mostly in Northern Europe markets
Probably there's too many good speakers