Parkour is increasing in popularity but the main thing about parkour is that it is relatively unknown, I'm tempted to say that now is the best time to do parkour because when it is a household name I'll imagine there will be certain laws and No Parkour signs. We will all talk about back when Parkour was free.
Thats why its important for us traceurs to create a positive image of parkour. Behave, be safe, and be respectful to property and it shouldnt be a problem. I think that people would rather see young men practicing parkour than doing drugs or illegal activities.