If I were to open a restaurant (which is something I would like to do), I would do a "high end" fast food place. The equivalent to a Chipotle but with more diversity than just burritos, tacos, etc. I find that fast food is VERY lacking in the quality department. If you think about places like Taco Bell, Burger King, Dairy Queen, etc they all have one thing in common: seemingly great food, until you take a bite. I know this is because people are only willing to spend x amount of dollar on a burger but I think some like quality food but would rather not sit in a restaurant. Good examples (I think) of good food that you don't sit down for are places like Five Guys (although you could literally wring out all of the grease), small Middle Eastern places that have simple, but amazing food like gyros and kabobs. I know this place around wear I live that has the most amazing gyros. They make the meat themselves; they don't use the frozen presliced lamb like many others do. Sure it's $6.50 for a sandwhich but it's well worth it.
Excuse me if this seems like disorganized thought or ranting, I am running low on sleep.