With regard to the first part about Taiwan, I don't think Taiwan is in a great hurry to unite with China, as you said. In fact, every time you talk to a Taiwanese about one country, two systems, they will laugh at you. They will say, today Hong Kong, tomorrow Taiwan. In other words, they don't want to follow Hong Kong's footsteps precisely because of what's happening in Hong Kong.
As far as honouring agreements is concerned, I'm sure it's part of the nature of a country or a person to try to wriggle out of an agreement after it's signed if it doesn't look to be in that person's or that country's interest. In the long run, how is a country run or how is a person held to an agreement? Everybody must live by the same principles, and you don't want to sign a treaty with a country that would interpret it in whatever way it liked to its advantage. That's the common standard everybody has to keep even though it's very difficult. I'm sure that's the correct position to take.