No. India, like Japan, is a one-party state where the fractious opposition has to coalesce around a major defector (s) and win only after the hegemon (INC/LDP) has taken too many fatal hits from scandal. In 1977 this was the Emergency. In 1989 it was Bofors and Shah Bano. Then the opposition destroys themselves quickly because their tent is too big and can't agree on anything besides dislodging the hegemon. By 1979 Janata fell apart due to interfactional squabbling (plus the courts squashing the politically motivated charges against Indira and Sanjay) and within 6 months Congress was back in power. Within 18 months of the 1989 election, Rajiv was on track to reclaim power with a majority government in a Trudeau '80 style comeback before Semtex Lady intervened. Congress ended up with a strong minority under his deputy.
Without any smoking gun like Bofors or the Emergency, Congress retains power until a smoking gun does occur. The BJP are at heart Hindu chauvinists and have often played a part in inciting ethnic violence, so the national unity card can easily be played against them.
Within the Congress Party, Sanjay will succeed his mother and his apolitical (prior to 1980) brother gets his coveted upgrade to 707s.
Without saying "Vlad Tepes", Sanjay's premiership would resembles his brother's in most aspects but one: internal security. His role model was Ferdinand Marcos, and the Emergency proved that he was intent on following said model to a T. I would peg the chances of his leaving office voluntarily, in good health and on his own terms at no more than 30% myself. His mother and he didn't believe that democratic institutions could survive prolonged severe political turbulence and that authoritarian measuers were the only solution in said circumstances.