"Given China's rise, its wise long-term to keep a presence in the region."
Why?
China will surpass the United States in soft and hard power eventually. This is demographically and economically inevitable. Even sooner, if not already, China will become an unshakable hegemon over all of Asia. So why fight it in the most expensive and futile ways possible, i.e., by maintaining the fiction that we will be able to exercise any sort of long-term military power in Asia?
It's time we focused on our economic power, and not our military power. The former is a necessary precondition of the latter, and we're acting as though it's not.