It's not a matter of whether China wants to become a superpower or not. China is being pushed into that direction by the forces of economics and security(survival). China's resources cannot fully support its economy or population, thus heavily reliant on imports of agricultural goods, minerals, high tech products and exports of manufactured goods. If China closes its doors, millions will starve, export industries will suffocate (leading to higher costs at home due to moving up the cost curve by producing less), innovation slows, cost of minerals skyrocket, political instability. The only way forward towards prosperity is to continue trade and also protect that vital trade which China currently lacks the ability to protect. A2/AD is only for defending the homeland from physical invasion but does nothing to protect its interests. If Chinese ships are blocked in foreign ports or open waters far from the home ports, what good are some missiles? Especially now with THAAD in South Korea, the effectiveness of these missiles are put into question. One can argue that China can just trade on land across the OBOR but its still in its infancy with many countries on route to Europe being unstable. OBOR on land also doesn't have direct access to Africa or the Americas. The only way forward for China is to have a navy(space, com networks, air force, ships, logistics, etc.) that will be able to rival the US navy. It doesn't have to be as powerful but enough to discourage conflict. Whether that is achievable or not is up to debate, but I don't see if China is on the path towards becoming a "superpower" (hate using that word) as a thing to debate.