Of course there would be increase in bitcoin purchases in Hong Kong. Think about what would you do yourself. We are talking about a whole nation (well sort of nation) getting a pressure from another nation that they are super tied with and that big nation is basically killing you right now and making laws all by itself and demanding the nation to be ruled however they want.
You can't let that happen but you see the chaos and you see people protesting, you are basically facing the fall of your government even if not in democratic ways it is definitely not doing well in popularity. It means these people will of course will take their money and take it to bitcoin, I don't know how much it will affect bitcoin itself as a whole but it definitely will affect the adoption rate in Hong Kong.
But it is easy to know what will happen next, whenever people begin to take actions to defend themselves from the actions of their governments the government do not take this lightly, you can be sure that in the future cryptocurrencies are going to be banned in Hong Kong and since they are in the middle of a crisis you can be sure that the penalties for using cryptocurrencies are going to be huge.
This means that those living in Hong Kong will have very few options, they will have to decide whether or not they like the idea of their country being dominated by another one or to just get out of it and not come back and neither of those options is very appealing to me.