The Left will not dump the Government (KeralaViews said earlier that it might dump the Congress.) It will wait for the Congress to strike a deal with the Samajvadi party before it withdraws support to the UPA, thus paving way for the nuclear deal with the United States. If it had withdrawn support earlier, the Government may have fallen. If the left parties really wanted to prevent the nuclear deal, it would have withdrawn support without notice so that the Congress would have little time to come to understandings with other parties.
Most parties do not want an election now. Congress and the Left is parting ways because of electoral exigencies. They need a lead-time before they face the electorate with opposing arguments. The so-called crisis over nuclear deal also helps both the Congress-led and CPI-M led governments to divert attention from price rise, inflation and other issues.
Otherwise, one should be wondering why the Congress was risking its government for a deal with the United States that is no way crucial for the country. Nothing particular is going to happen if India did not sign the deal. India had developed its nuclear assets on its own. In fact, the performance of the Atomic Energy Department was better that the Indian Space Research Organisation. While the latter brought, adapted or copied rocket technology from other countries, the former developed the nuclear technology on its own. If at all India wants more nuclear power plants, it has the technical capability to do so. It also has the raw materials. Only, the capital needs to be found.
Even if the deal would help the energy sector more than indigenous efforts, nuclear plants could become a liability on account of the decommissioning costs and problems in disposal of wastes. Being a vast country, India has several alternative sources of energy waiting to be tapped.