It is just a drama and friendly fight between Congress, Left and SP. They wanted to divert peoples' attention from the galloping inflation, in which they hv already succeeded. Now the inflation is near 12% and there is no murmer. When the inflation was 8%, there was lot of hue and cry.
Nothing will happen if the deal is not signed immediately, as the next US President will also sign the deal very willingly, as it is very good for the businessmen of US.