Your biggest advantage was economic. But China's growth means you are now tiny compared to them, and you have a reduced ability to pay other countries for diplomatic recognition.
Unlike the poster you replied to, I think this is deeply unfortunate, and deplore the fact that China wishes to gradually take you over. But, the strategic outlook is bleak: your western allies share of world GDP and military power shrinks every year, and the US has turned fickle. China meanwhile outpaces your growth every year, and is getting more and more power over countries that neighbour you.
I don't think it would ever be an invasion, but rather a slow strangling, and a carrot of union offered. And it would be a long term project.