Why not an Indian food chain?

In corporate America, we have chains for every retails sector and food is not an exception. There are Italian (Olive Garden, Buca di beppo), Chinese (P. F. Chang), Mexican (Taco Bell, Chipotle and … ) and other American fast food stuff (and possibly junk) like Mac D, KFC, Burger King, Wendy, Arby and tons of other. The fact, which surprises me, is that there is no Indian food chain. Indian food is quite famous among the western world and especially in United States. Whenever I go to some good Indian restaurant, I see more people of non-Indian origin than Indians itself (based on the experiences at SFO, CA, Mountain View, CA, Palo Alto, CA and Cincinnati, OH). So why have not any entrepreneur thought of an Indian food chain endeavor? I disagree to the argument that there is a limited market or a narrow business opportunity in starting a Indian food restaurant. According to me if done in a cost effective way, standardized, cuisine adjusted to the western palate and with proper marketing effort, Indian food chain should be an excellent business opportunity, which for some unknown reason is still unexplored. Any thoughts?