I think it is time to deal with this situation in general. The Indian government needs to be working towards the systematic abolition of polygamy, at least for any future occurences. This has to be done across religions, because this practice is prevalent among many Hindus and Adivasis as well. In my opinion, such customs don't have a place in today's world, and we need a law which makes us progress towards becoming more modern.
It is my understanding that Muslims had this as a provision during the times of tribes and tribal warfare. So if any particular tribe suffered many casualties in a war, and had more women than men left, a man can marry and care for more than one woman. It is important to note that the man had to show that he was willing and able to care for them equally, emotionally as well as monetarily. Anyway, that was in the past and now our country had more men than women, so no point in using that provision. I agree that the Quran should not be modified, but the Indian law can be made above all religions, if we want to call ourselves secular. The same applies to banning all other outdated practices across religions. Religion belongs to your home and heart, and maybe for community gatherings, not for running the country. In matters of conflict, a uniform law has to take precedence.