Forgive me if I offend anyone, but I think the reason most people stop wearing the turban is all down to one thing, how we see our self image. Most men stop wearing the turban in the age group between 16-27, and I think the reason they do, is the very reason possibly that it was encouraged in sikhism in the first place, sex!.
Now lets be honest here, when I look at the photos of my dad in his teens when he married my mum, he does not look in the least bit sexy, he looks, like he always has, a man full of love, for his wife, for me and my idiot brother, his parents, beggars in the street, you looked at my dad, and thousands of sikhs just like him, and you didn't see raw sex appeal, you saw goodness, honesty and truth. At that age, I had no interest in these things, I cut my hair to look more sexually attractive.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=35124
I am not saying that turban wearing sikhs should not be sexual titans, however it is more the promiscuity that the Gurus frowned upon rather than sexual happiness in the confines of a loving relationship, I think they knew that wearing a turban would make most young sikhs proud of the heritage, and meaning of such an item, rather than, like me, view it as a hindrance.
No, I am afraid turbans are not sexy, they do not say, come over here for a wild night of hanging from the ceiling, rather , the opposite, if you feel like a wild night of etc etc, come over here and we can debate what makes you want to lose yourself in wordly pleasures instead of trying to connect with the almighty.
Of course there is the other reason we should all wear turbans, My father looks like a king in his splendid beard and turban, ( he is only 60, he had me young) , I on the other hand, given my lifestyle and lack of hair, look more like a potato, in fact, I would concede that my father actually now looks better than me!
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=35124
I would say to any young sikh thinking of abandoning the turban, there are people who will spend entire lives looking for what you have already got, value it, appreciate it, you were born princes, lions, do not look like a donkey for the sake of a few cheap thrills that could cost you your family and your reputation.