Drive In Theatres - will they be relics of the past?

Mohan has a post about the Prarthana Drive In theatre on the ECR, Chennai. I have never been to an OAT before but by going by what Mohan has written, methinks it's not an oportunity to miss, to watch a movies under the stars, in the comfort of your car, cuddled with your wife/girlfriend or having some fun with your friends.