Nothings going to happen even if people start dying. At best (or at worst), it will be used as fodder for a political slug fest with AAP blaming BJP for the pollution, BJP blaming years of congress rule and Rahul Gandhi as usual coming up with some nonsensical rant and nothing more.
Thousands of people die in needless and silly accidents (on road, trains and everywhere else) that could be very easily avoided with some some attention and care from all people. In Mumbai local train related incidents alone 12-15 people die every day falling off from the trains or while crossing the tracks and an even larger number get injured. The tally of deaths for an year is over 5000 and that is just for the local train network of a single city. Did it teach anything to the people?
Diwali has nothing to do with fire crackers. Fire crackers were a Chinese invention from just 2200 years ago and Diwali has been around a lot longer. Every year, thousands of people with breathing disorders die during the Diwali season due to the heightened pollution. but for some reason, people stubbornly insist on it even when they know that this industry almost exclusively runs on child labor and abuse and they know about the long term consequences to the environment. Its silly people talk about vehicular pollution when we are such a major source of it in festival that almost single-handed multiplies it many fold.
Life is cheap in our country and people have repeatedly killed over Rs 5 or 10. That's how cheap it is. So people dying due to heightened pollution wound't make an iota of difference because we already have lac's of people dying for various other silly reasons every day. The only time when people get into a rage is when its some terrorists doing the killing instead of their own silliness. If our country were the type that could learn from its mistakes and change, it wouldn't be such a piss hole today.