I still think (or at least hope) that the US rhetoric is mainly just rhetoric and that more rational minds will prevail. US actions in the Phillipines and Taiwan currently are aimed at antagonizing China rather than provoking outright war. A war has the potential to end in a strategic nuclear exchange, which would be a worst case outcome for the world. My previous theories regarding full scale economic war may be exaggerated, but I still believe the US's primary goal is to gather support to erect partial trade barriers against China to protect US market share in overseas markets (specifically for high value add industries).
I believe that this bolded part isn't worth potentially losing control over Taiwan, or the Philipines getting slapped by China (when they have a defense treaty signed). Imagine the loss of reputation they would suffer which is their true lifeline as an empire. They would lose more.
So, if all those orchestrated baiting provocative actions performed by those 2 pawns, and US rhetoric, are simply materializing in other to provoke China to assert its dominance there (in order for the US to achieve the bolded part), then I don't think it is worth it for the US.
In the past 70 years, Taiwan was a lot wealthier and advanced than Mainland China, so there was never much incentive for the Taiwanese to pursue a political settlement.
But the China-Taiwan relationship will be very different in 30 years, given that China has an overall commanding position in the technologies of the future. The studies indicate that all these productivity gains will end up as higher wages, and if China is the most technologically advanced, that argues for the world's highest wage levels. And with 3-4x the US population, that is a tremendous economic advantage, which is the foundation of all other forms of power.
At the same time, we're finally seeing the beginning of a US debt spiral happening. I give it an 80% chance of a crisis in confidence in the USD. It might happen in 5 years, but I don't see it taking 30 years.
Personally, I see about an 80% probability of the US being displaced out of the Western Pacific within a 30 year timeframe.
As for the terms of any reunification, I think a veto over foreign affairs (aka a confederation) would be acceptable to both Taiwan and China.
I'm not challenging that the Chinese are going to get enormously wealthier in the future, but it is questionable whether that will translate into tangible changes in opinion inside Taiwan when you still have the US controlling and mass-brainwashing them through media.
So, you are not addressing the right point, you are addressing your assumption's validity itself, not whether this would affect the underlying thing we are talking about (will of political reconciliation, soft power, or however, else you want to frame it).
You have just in the last 30 years self-identifying as Chinese ethnicity going from 25% to 2.5% percent last year. Whereas Taiwanese identity jumped from 17% to 60-80% in the last few years.
DPP von last 3 elections, as they were getting more hawkish and you have pro-unification survey responses dropping from 20% to 7.5% in the last 30 years.
So, as China was getting wealthier, closing the gap, during that time, not only didn't things stay the same, but they even deteriorated more.
So, why would Chinese economic progress make a magical turn-around in outcome in the future, for some reason, when it never did by now?
To be honest, a train toward peaceful reconciliation already passed a long time ago. You have entire new generations thinking they are living in a totally separate country like Spain or Italy, as opposed to being inside of a Chinese province and having Chinese historic roots.
Those older generations are also dying, they are those KMT voters. The case for your argument will only get worse as time passes by.
You have dozens of surveys/polls/research done on this exact topic, and they all show the same things against "time working for China".
Let's be realistic here, there is absolutely no chance no matter what China does, even if they all become as rich as those oil sheiks in Dubai, for Taiwan to suddenly wake up one day and come back peacefully, there certainly needs to be a kinetic shock therapy of some extent first.
Or if the US collapsed, and with that, their media-brainwashing hard power over Taiwan, only then I see Taiwan returning peacefully to them.