Actually even longer than 15 years, the US has all-too-generously allowed the CCP to continue to exist ever since we benevolently allowed their army to fight ours to a standstill on the Korean peninsula in 1953.
I don't see that happening anytime soon, for a simple reason. Right now the three major world powers, CCP, Russia, USA, all are benefiting from the status quo. Everyone is prospering, when a real threat, such as ISIS arises you'll notice everyone worked together quickly to stop something that threatened the global order. The posturing over Iran, NK, and the like is just mostly for show.
What we need to be worried about is if any of these powers start to sliding towards a major decline, right now things are good people have a lot to lose if there is a war; however if the balance of power is too lopsided and one of the sides is at real risk of losing, that's when nations get desperate and start to do things that are dangerous.
World War 1 would've never happened if the the Russian Empire wasn't on the brink of collapse, but Russia felt it had to act because it would slip out of the ranks of influential nations. That is when the tinderbox exploded.
What I fear is that in the next World War, the US is currently looking like Germany, with their fancy tech, their super "intellectual" military doctrine, and their entrenched bureaucracy.
Russia is keeping their armies battle ready and tested in the Ukraine and Crimea, the CCP isn't as battle ready but as Vietnam and Korea proved they still can beat the US. Things are going to be interesting over the next 20 years...
I really hope it doesn't get ugly, but it could. We are so different than them, I just don't see how we go back to business as usual after this mess.