If they suck Taiwan back into the fold, instant billions in their collective commie pockets.
Did Hong Kong noticeably influence their economy?
It wouldn't matter if they did or didn't. Taiwan's money would be their money.
There are plenty of chicom government people that have become rich over the Hong Kong capture.
But there is some good that came out of it. Hong Kong has taught the chinese a lot about how to run an proper economy. A capitalistic economy.
"Did Hong Kong noticeably influence [China's] economy?"
China promised to keep their sticky fingers out of Hong Kong's cookie jar for 50 years after the transfer of sovereignty. Unfortunately, there is absolutely no way to enforce that promise. So, of course, it didn't even last 50 minutes. Since then, China's "Socialist economic miracle" has been propped up by a leveraged embezzlement of Hong Kong's capital.
The next step in this process will be for the most gullible of Western investors to finally see past the shell game and figure out that loaning money to Hong Kong today is basically the same thing as handing it to the Communist Central Committee.
D'ja ever wonder why moonbats who barely know what a checkbook is -- let alone how to balance one -- protest the G8 and World Bank every time they meet? If not, don't worry, I'm sure the marchers dont have any idea themselves -- but the granola their Communist handlers feed them ain't free, so you can bet your butt that THEY know why they're doing it. They're trying to keep China's "Normal Trade Relations" status as long as they possibly can. (Remember, they changed the name of that in 1998, after Clinton caught a shit-storm for defending China as a "Most Favored Nation" in 1997 -- the year they started cooking Hong Kong's books.)
The EnviroCommies know perfectly well that once the props get pulled out from under China, that Three-Card Monte scam disguised as a country will fall apart even faster than the Soviet Union did. And after just a little bit more cleanup, Communism will finally end up in the dustbin of history where it belongs.