As much as I absolutely LOVE Chipotle, I'd have to vote no.
Would rather see original items in the park as opposed to something you can find most anywhere else.
Graeters, LaRosas and Skyline are different.
They are (for the most part) unique to the Cincinnati area. I can see reasoning for those to be in the park.
Hell, the only worse decision would be to put a Starbucks in or a stand that would be closed on one of the busiest operating days of the week. <G>