'84 as an issue has been raised quite a few times. Everytime, it resulted in the same point. It was claimed by Indian side that it was an aberration and not a state policy and it happened because of militancy in Punjab. Heck, I have seen written signed statements from local Punjabis about how militants back then were actually harming locals in Punjab, ones submitted by Indian representation. Hence '84 alone is not enough to build a case. Sikhs know this well. Atleast those who care about it enough.
Thus, a much wider case has been proposed. It shows that '47 was a flawed partition and ask for repartition of India and Pakistan to carve out a Khalistan with capital in Lahore. It basically tries to establish Sikh history as a long and separate third community -- a persecuted one-- and hence a nation.
Needless to say, it is a non starter. Hence I don't think this kind of activism is going anywhere. As seen even in UK case, most of Sikhs are not exactly bothered about it.
Lastly, if you ask Sikhs in Punjab about it, most common response is this : Are you folks going to come back and live in your new nation if it comes about? Well, its a valid question. Most of Sikhs from outside Punjab have trouble answering it.