I think that it is just too late. If Haridwar can get holy city status then why not amritsar?
The reason they don't want to do it because if holy status given then Meat and Liquor will be banned from the city. Plus they simply want to continue to suppress the minority. Majority of the Amritsar residents are non-sikhs.
Those who think Amritsar is not important for Sikhs; needs to get their head check.