From my observations, KTM did a great job at taking over most of the offroad market during a period when others gave up, screwed up, or just didn't have a clue.
Basically by the mid 80's we lost several manufacturers that had been prominent in the market up to that time; CanAm, Bultaco, Sachs/Hercules just to name a few.
The Japanese all but gave up; What ever happened to the Suzuki PE's? RMX's? Yamaha IT's? WR 2ts? Kawasaki would still own a big chunk of the market with the KDX if they had modernized it, but they also chickened out and gave up. Suzuki and Kawi made a couple of laughable recent efforts with their KLX450 and (the ridiculous) RM450-X, but they were doomed from the start. Honda? let's not go there.....
Husqvarna almost disappeared due to a few screwed up ownership changes, made a heck of a comeback since 05-06, but I'm concerned they may be trying to shoot themselves in the foot again.
Who's been there all this time? KTM. It took a while, but by the late 90's their bikes were pretty good and they just kept at it. They also partnered with Red Bull & hired some farm boy named David Knight & several others such as Juha to really bring notice to their brand.
We can make fun of them etc., but they did everything right (mostly) while everyone else screwed up. They have become the standard.
Meanwhile GG has been quietly plugging away in Girona, steadily improving their bikes year after year and can now, in 2012 finally say(with absolute certainty) they are as good or better than KTM. Plus, they look so dam good!!!