The main question is if dastar was mandatory for women then why just it vanished from
sikh society until it was revived by akj and some other jatha's.The sikh's were spread in large area of india and if dastar vanished from one area due to some circumstances even then it could have survived in other area's.I simply cannot beleive that sikh women wearing dastar's just vanished from sikh society.
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The Sikhism Home Page: The Khalsa
Dastar:
Turban. A symbol of royalty and dignity. Historically the turban has been held in high esteem in eastern and middle eastern cultures. Guru Gobind Singh transformed this cultural symbol into a religious requirement so that the Khalsa would always have high self-esteem. It differentiates Sikhs from other religious followers who keep long hair but wear caps or keep matted hair. The turban cannot be covered by any other head gear or replaced by a cap or hat. The turban is mandatory for Sikh men and optional for Sikh women.
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So I think we should accept that it is optional for women and if sikh women feel's
stronger in dastar then they have every right to wear it but if sikh women want's to cover their head in chunni then too have right to do it.