I remember reading a book, can't remember the name, where Steve Davis said of the Chinese players back in the 80's that they were barely of a 30 break standard. Now, there are tons of great players in China. As more people started playing snooker the standard rose to the point it is at today in China and now Ding is tipped to be a future World Champ.
I think for the US it would be an organic process. If more people take up snooker seriously, the competition will improve. It's really tough to develop a world class player without anyone at or near that level around them. But now is as good an opportunity for players than ever, since they can pop over for a few weeks and give Q school a try. Back when you had to qualify through the Pontins Tour or any other tour based in the UK, it was not reasonable for most to bother, regardless of skill.