It would be foolhardy for the BBI promoters to fully reopen the document to incorporate the myriad wish-lists being bandied about by various protagonists. While some are reasonable and would improve the product, a good majority are self-seeking antics that have no place in a constitutional review process while others are sideshows intended to do no more than jettison the entire project.
Having said that, it would be just as foolhardy to proceed on the mantra that the BBI, like the biblical law of the Medes and the Persians, cannot be changed. Two perspectives inform this latter position.