I'd hope that 'total collapse' would be self evident enough that I would not have to look at the data. But, Good data would convince me.
for social collapse, 'Pew Research' has conducted stellar surveys. I'd start there.
Another solid metric is low-income refugees. If a measurable number of low-income minorities start leaving India for countries of slightly higher average income (eg: Bangladesh, Philippines, Indonesia), then it's either a sign of collapse or religious authoritarianism. Differential rights is another sign. say for instance, if there exist specific laws that only Indian minorities have to follow nation-wide.
As for press freedoms, every political opposition party should get to have their own newspaper that can be freely shared on social media. ie. exception to exclude any party that actively seeks independence from India. Private universities should be allowed to teach anything that is constitutional, ie: don't teach violent fundamentalism or birth based bigotry. I should be able to call Modi any non-caste-based slur (Fascist, Bigot, Loser, etc.) on social media without getting a case thrown against me or violent assaulted on the streets. The front page of the Caravan or Scroll.in (online subscription based news media, subscription so I know they will be alive unlike ad reliant ones) should still contain a scathing accusation towards the BJP as it always has.
For economics, poverty and safety, the numbers should be easier to obtain. Proxy metrics like electricity availability, internet availability, infrastructure building and use rate, etc. are also great.
Those are my metrics on 3 fronts.