Heh, I think this list has been posted on just about every forum out there, accompanied by a "Why wasn't ____on there?". I think Doug definitely deserves to be on there, as well as John Petrucci, Devin Townsend, Roine Stolt, and many others, but unfortunately, nobody really knows who they are, and the guys who make these lists tend to focus on the impact the musicians have made on the music scene. While all of the guys I previously mentioned are some of the most talented out there, they've barely made a blip in the large scheme of things, which is unfortunate, considering that they potentially could, but oh well, that's just the way it is.
On the upside, I think it's cool that John McLaughlin made the list. I really wasn't expecting him to be there.