Hard to say. Their star is certainly rising just now.
But I don't think that their road will always be smooth. The political structure there is not stable over the longer term, in my opinion; pressures for more democracy will only grow as prosperity increases and the middle class grows.
Also, many climate models project serious water supply issues for China as global climate change continues over the next few decades. (For some quick details on that, consult my Hub on Gwynne Dyer's book "Climate Wars.") That will probably impact their food security and impose political strains, too.
Lastly, they will need to devote considerable energy to maintaining security in their immediate neighborhood--Pakistan is in serious trouble, IMO, and will demand considerable attention from China and India both (as well as the USA!)