The motivation to invade Taiwan is rooted in the PRC's political and historical narrative about it's legitimacy and purpose, a narrative internalized by most Chinese, including especially the military. It's in a sense existential, not economic or realpolitik, and I don't see that motivation diminishing anytime soon. If anything it's growing stronger, as evidenced by the suppression in Hong Kong, which made zero sense without reference to how Chinese political institutions sustain themselves. The risk of an invasion sparking a conflict with the US is primarily what held them back, and at best economic and foreign strategic pain only secondarily, but all those risks diminish by the day, leaving China's raw existential motivation unchecked.

The biggest victory for CCP will be Taiwan willingly joining PRC. Nothing else will be a better testament to the CCP model

Reunification with the mainland isn’t a completely unpopular idea in Taiwan. The economic ties are already extremely deep (largest trading partner by far).