This is my unbiased opinion
Why did the Sikhs not choose independence at the time of partition.......i don't know, but would an independent Sikh state be possible today...... i highly doubt it as it will lead to alot of bloodshed and the result would be the same as what happened in the 80s or what happened to Hyderabad.
But the real question should be, Does an Independent Sikh country provide any extra benefits that the Sikh community can't get as part of India.......I don't think so. It would be too small a country, being landlocked it will be highly dependent on Pakistan and India, the country would have very limited resources and the people that currently can go anywhere in India to get a job, otherwise they would have been very restricted.
Lets take an example of Afghanistan. Its a much larger country than what an Independent Sikh country would be. it has a lot of mineral wealth in its mountains but it is totally dependent on Pakistan and Iran for any sort of trade and food resources. The Afghans even though they might be the same people racially to North Pakistanis but are still looked at as foreigners, they don't have much rights or opportunities available to them that they would have had if they were part of Pakistan.
Alot of people will give the example of the smaller sized countries in Europe. But what they don't take into perspective is that even they decided to form the ( European Union ) to reap the benefits that otherwise was not available to them.
So in my opinion being part of a larger federation is better for the Sikhs. The best they should go for is an autonomous state with-in the Indian Federation but even with that i am not really sure what extra benefits they will achieve.
P.S. I understand that this is not what alot of people wanted to read, but these are my personal views.
@Nilgiri @MilSpec @Joe Shearer what do you guys think? I would also like to hear the views from the Sikh members