The Japanese and Koreans built up their own countries. Yes, they had US help, but their cultures are very success oriented. There are countless US allies that have languished in third world conditions including many Latin American countries, the Philippines, African dictatorships, and a lot of that has to do with their internal systems and cultural values.
But I agree, China does suck in terms of building up its allies. Part of it is because the US, because of it's dominance, took most of the successful countries as allies, including Japan, Europe, Australia, etc. It wasn't that the US made them successful, but they were already successful independently.
Who knows what the next 50 years will bring though. There are countries that are following China now and are modernizing rapidly. Ethiopia, Cambodia, for example are modernizing very rapidly and much of that investment is from China. There may also be major shifts in the alliance systems where many former US allies will move towards neutrality or may even start gravitating towards China in the next few decades.