I didn't know that warmongering over China was so popular with alleged radicals. You learn something every day.
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At least some of that image is inaccurate, there appears to be a US military base in Hong Kong?
Nor are there any in Cambodia, and the closest to a base in Thailand is a research project into infectious diseases as a partnership betweenthe Thai government and US Army "Medical Component of the Armed Forces Research Institute of the Medical Sciences". Calling this is a military base is a bit disingenuous.
Nevertheless it is true that the US military has a network of bases in Asia, and it is also true that they would be gone from South Korea if they didn't want them there to ward off the threat from North Korea, possibly with Chinese backing; and that they would be gone from Japan if Japan didn't rightfully fear what Chinese hegemony in the Pacific would mean for its own security. Likewise the Philippines tried to get closer to China and China took that as subservience and started infringing more shamelessly on their territory, so they promptly invited the US military presence back.
There is nothing "radical" about hoping that Chinese hegemony can supplant US hegemony, and certainly nothing radical about ignoring the desire of Taiwan for self-determination and democracy over Chinese fascist rhetoric about blood and soil and threats to re-educate Taiwanese people after military subjugation.
What I would hope for is for the development of South East Asia to mean the ASEAN countries can cooperate on defense alongside Taiwan, Japan and South Korea so that they can defend themselves against Chinese hegemony without reliance on the US. This is a consistent anti-imperialist position; supporting China against the US is no more progressive or radical than supporting the French Empire against the British Empire, or perhaps closer to supporting Nazi Germany as an alternative to British imperialism.
I lived in China for several years and it frankly only got less attractive to me as it developed, especially as Wechat et al made the surveillance state and propaganda omnipresent and as social media became heavily astroturfed and manipulated and as Xi became an outright dictator.
The US at least has space for opposition and social progress - the Civil Rights Movement is unthinkable in China and almost nobody cares about or thinks about the plight of Tibetans or Uighurs or Mongolians due to the highly efficient system of propaganda which prevents anyone hearing anything but the official line. Independent trade unions are also impossible and working conditions are terrible as a result. Economic inequality is comparable to that of the US and the Party elite are tightly fused with the capitalist elite.
In the US there are widespread protests against Israeli bombardment of Gaza, a tradition continuing from protests over Iraq and Vietnam which I believe can serve as a moderating influence on US power; I cannot imagine similar protests in China over a Chinese invasion of Taiwan, or Chinese support for North Korea invading South Korea. Similarly while many white Americans said Black Lives Matter and joined demonstrations in solidarity, Chinese were silent over the mass incarceration of Uyghurs and destruction of their culture as a consequence of the absence of any political freedom or freedom of speech and most are ignorant of how many Tibetans have self-immolated in desperate protest against Chinese occupation.
A hegemonic China will only seek to export its authoritarianism as freedom of speech in general is a threat to the ruling party. A Chinese Communist Party member once told me that they will get rid of the firewall only once they can have sufficient control over discourse outside of China, and it is clear to me they already seek to do so, they already maximally use all their economic leverage to try and coerce countries into giving way over even the most minor of slights, and to coerce foreign companies exposed to the Chinese market to censoring on their behalf, flooding foreign social media with bots and propagandists. I don't see why they would change this behaviour once Chinese hegemony supplanted US hegemony, so I see no reason to cheer for it.