Kitsune, that the point. An alternate should be bullet proof, and available to anyone who files it. If too many people file MCM inbound to HKG than the airport can accept, then the ATC computers should reject the request. It will only be when most transpac carriers have to carry Naha that something will be done about this.
It is unacceptable to be told that your filed alternate is full. That airport should have stopped accepting themselves as an alternate at the planning stage. There are SITA networks available to ensure this. Don't hold your breath on this though as it could be years before it is implemented.
Oh and ken yes I know my forum name is transparent to most people that know me, that's why I use it. But do you know my phantom postings name?