2047 is just a number.
I can guarantee you, buy 2030, the HKD will be a thing of the past and we'll all be buying things in CNY, Cantonese will be limited to a few locals as Mandarin becomes the native language due to the filth from the north migrating to the south. The line between HK and Shenzhen will remain in place only to serve as a reminder of how good it used to be.