I think expecting/ hoping RERA to help settle the issues regarding the one sided purchase agreements is wishful thinking. RERA is part of the DUbai govt. and as such is only interested in making a profit, with no regards for doing the right thing. Now if they can see some sort of a financial gain from doing the right thing, then there is hope.
In Dubai in case you haven't noticed, there is no right or wrong. Only business as usual.