Given that some people bought in to this scheme up to 6 years ago, has anyone tracked the asking prices of similar apartments in the development over that period. I would be very interested if someone had that information to share.
To the op's point, no one seems to be able to declare categorically that you would not be able to get out of the contract based on the length of time it has taken to complete or other possible clauses in the contract. I think that all you can surmise from the answers of the assembled wisdom, is that no one knows of an easy way to do it. I am sure that some of our learned legal participants have in their careers been surprised at the outcome of some of their cases !
Personally I believe that many contract / legal battles are won by the party with the deeper pockets, so how do you fancy yourself against Treasury Holdings?