Yes
No
Depends
None of the above; please specify
As the legal system is dismantled and HK is absorbed into the mainland and is no longer a global financial hub, what realistically is going to uphold property prices when one can easily pick up property in the GBA for a fraction of the price in easy travelling time.
Nothing but a heist.
Unless you are not interested in getting around in Central (I certainly am not). Central is definitely already overcrowded, so building housing for another 2 million people in that place might not be the best idea. You could also develop Tin Shui Wai to be a modern centre (a second Central) and put high-speed rail to commute among these two areas in 15 minutes.