In my view, Khalistan as an ideal or a fantasy has its deep place and roots in the heats and psyche of most of the Sikhs, particularly the educated ones; but, equally, most of the Sikhs, particularly those living in India, don't consider it a pragmatic, realistic, achievable and viable concept. So, it is only a small minority of Sikhs, which is pursuing this idea politically or otherwise. Most are, by and large, content with the existing political arrangements, within the Constitution of India. The support for the idea is far more in expats Sikhs, than those living in India.
Had Khalistan been a viable and achievable option; Jarnail Singh Bhindranwale would have demanded it. He never did it. His whole movement was to gain certain degree of autonomy for Punjab, based upon "Anandpur Sahib Resolution".