Retailing is an interesting concept with huge opportunities. Now the options to expand in retailing is to find the niche markets. Quick Service Restaurants are fast catching up with places like Frankies, Tibbs, Chai Point etc
But I do believe there are still more niche spaces such as chaat centres. Chaat is all time favorite for most Indians. But there are limited places offering hygienic chaat on a QSR mode. A chain of Chaat Shops would be the next idea to see soon ;)