The Saudi league will succeed because the government are relentless enough to want it to (and wealth beyond imagination to fall back on), much more so than the Chinese government. Considering the other megaprojects they've got in the works, I don't know why people think they're a flash in the pan.
Yeah, sadly, my 14 year old cousin (a Man U fan, but I still love him) recently expressed an interest in following Al Nassr because he loves Ronaldo so much.
You have to remember that we're the 'legacy' fans stubbornly tied to supporting one club and we've already been dumped to make way for fans of superstar names.