It is extremely important for the deal to be operationalized for 2 reasons 1. Meeting the long term energy needs. 2. To make sure that India's international standing does not suffer a loss in terms of credibility.
If the price is that govt. has to fall, I think UPA should be ready to pay this price. And it is upto the people of India then to give a mnadate in such a way that such dependencies on fringe players is finished and any single like minded coalition or party is in charge, without any pulls & pressure.