I personally would like to see East Asia more unified and less reliant on an increasingly unstable country like the US. They will collectively have to rely on foreigners more in the future anyway due to low birth rates as Japan already does. A lot of people serving food were Chinese when I went there. About 50% of the tourists were also Chinese.
I think the sentiment is nice but historic greviences still strong. Utlimately the problem isn't more or less reliance on US security hedging but force balance being so lopsidded in PRC that US don't matter. Reminder TW use to have the largest airforce in East Asia. At somepoint (that we're probably well past), US not capable of east asia security gurantee. And whatever you think about recent PRC/JP tussle, and ignore takaichi picking fights with RU over sakahlin and SKR over dokodo within last few weeks, JP having maritime/territorial disputes with all her neighbours despite beign loser of WW2, where her borders should be prescribed by treaty, is going to lead to messy situations.
I would not like to see East Asia more unified. The current boundaries are fine and the US treats Japan quite well while China/Korea are not ready to tone down resentment yet.
Full unification is similar to the Greater East Asian Co-Prosperity Sphere (大東亜共栄圏). The foundation would probably be some ideology centered around the area’s 3000+ years of shared Buddhism and Confucianism, rewarding wealthy multi-lingual business families more than the average person.
Something more realistic and beneficial to you (assuming you are Asian in an English-speaking country) would be world unification .
