The big question is, "where would you want to taxi to?"
There is another heliport operated by the government and soon to move to the Exhibition Centre on Hong Kong Island at the end of the year but only open to companies that sign a contract with the government.
I suspect that once the mainland airspace is completely open and not restricted by the PLA then cross border operations may become a real option. There are plenty of local guys watching the signs.
Heads Down, Look out for the flack