Definitely some truth in what you say, but ,,,,
I think that Matchroom's jump into producing the World 9ball in 2000-03 may have been the single biggest moment in the growth of pool in Europe. In the 1990s, you could count the European cueists that played international events on your fingers (Souquet, Ortmann, Feijen, Lely, Chamat, and few, if any, others). The Euro-tour, which was formed in 1992, had yet to attract too much attention. A couple of years later, the Mosconi Cup was devised, but Europe usually took a beating. When European cueists could suddenly try their hand at American pool at the World 9ball in Cardiff, American pool's place in their collective consciousness skyrocketed. Even though the World 9ball moved to Asia in 2004, the seed had already been planted. Euro-tour participation took off, and within a decade after that, European pool had caught and passed American pool and since 2009, America has won just two Mosconi Cups.
Whether the World 9ball might have been the launching point for a tour even back then is certainly debatable, but the four events in Cardiff are among the most important ever staged because they jump-started Europe's wide participation in American pool.