For the next 20 years, unless it was truly a Pearl Harbor style unexpected sneak attack in times of peace, the chances that Chinese carriers can conduct a successdul strike against a US base in Japan or an US island territory, let alone escape intact to remain useable national assets, is nonexistent. If china were to succeed in striking at these bases in times of war, it would be with ballistic missiles in the near term and ballistic missiles, long range cruise missiles and bombers firing stand off weapons in the medium term.
For the next 20 years, the role of Chinese carrier would be to ensure sea control in areas that would be at the distal end of the operating ranges of land based air power of one of the SCS nations, or to confront the Japanese navy if Japan were to pursue independent aggressive action outside of Japanese-US security treaty, or to act as a fleet in being to inconvenience American fleet operation within 1000 miles of Chinese shore, or to mop up an American task force that may have been damaged by shore based air power.