as it's been pointed out before, it's an inevitability, but people are assured it's not very soon.
As a Chinese diplomat said once, the US nuking China over Taiwan would mean a retaliatory nuke and the world ends. The odds of nukes are so low I think we can rule that out.
But still, do they have much else economically or diplomatically to lose from eventually attacking Taiwan in an attempt to seize it through conventional means? I don't think time really matters in regards to the "when"