Chipotle already has a booming dinner business in most of its stores. The difference is its dinner market is mostly moms or dads picking up dinner to the family and not dining there. That is probably why you may not see to many people eating at the actual restaurant.
As for breakfast that would be a great idea but extremely hard to implement. Cooking things like eggs and other breakfast food would cause CMG to spend a lot of cash on each location on the machines to cook these items. Mexican food for breakfast is something few americans know about but is very delicous. Juevos rancheros and breakfast burritos are just a couple of the itemss. People also assume all mexican food has to be spicy when the truth is most authentic mexican breakfast food isn't.
One idea I do think they should implement which is feasble right now is a children's menu. All of their items are huge and $5 and up. I kid's menu would not only let children eat there but also accomdate people with smaller appetites.
The beauty in Chipotle is its simplicity. When you start adding tons of other items like breakfast and new dinner ones you start losing some of the flair that has made it great. The higher-ups know this probably better then we do though. All IMO though.
This afternoon, I got a wild hair and rifled off an e-mail to the home office suggesting that they expand their menu a bit and offer a really good chili. I don't know...sounded like a good fit to me and afterall, there is NO place you can go to get a beer and a fast bowl of chili. Wouldn't take lot of extra inventory and it would be a great place to dump the extra meat. Doesn't Wendy's do that ?? Anyway, not 5 minutes passed when I got a real nice response saying that they are not at all interested in expanding their menu. They want to do just few things really well. ....And,... that's that !! Then, I suggested they offer a "Tortuga". Something I had had in a bar in Cozumel. Soft taco tortilla with Jack cheese and sautted onions and peppers with some meat. Haven't heard back about that one. I bet they won't like that idea, either.