As Skor mentioned, the myriad reasons for the US lagging behind the rest of the world have been hashed over in these forums and nauseum, and in the 10 or so years I have been visiting this forum, not much has changed as far as I can tell.
SVB is still our Captain America, Sky still hasn't won a major (not to take away from his MOT), and aside from a brief, mostly dimmed glimmer of hope from Wolford, Styer , Reinhold, and now verner, there is no dominant heir apparent ...or at least one on the level of a young SVB or Sky.
Still, I would love to know the statistics on A). Sheer number of people who play pool at least once a week in the US vs. other countries, and B). The amount of money that is spent on pool equipment/gear in the US vs. other countries, and C). How many in the US have the dreaded 7 footer in their garages, man caves, spare bedrooms, etc.
I am still amazed at the number of random league players who couldn't pick but maybe 2 of our MC members out of a police line up, but yet they show up several nights a week carrying their JB Case filled with well over a 1000 dollars worth of cues and equipment.
I would imagine the big industry sponsors (Diamond, Cuetec, Predator, etc. ) heavily rely on US dollars, and that is a big reason MR puts much more resources into the US vs. Viet Nam or the Philippines.