First of all lets congratulate Congress that it has come out of the shadow of Nehruvian philosphy of anti-americanism. The debate is not about the deal per se. Its about the whole gamut of our relationship with the United States. The supporters of the deal favour a strong relationship with the US whereas the opposers are not in favour of the same.
This is a good point. Let there be Mid-term elections-a kind of referendum on our relationship with the USA. If the supporters win, the deal will be through and the government can whole-heartedly enter with full-fledged relationship with the US. If the opposers win, the deal will be scrapped and in that case India can join The Russo-China block.