Where to begin. I think Ryan made the most helpful comment which is CONSISTENCY in whatever you do. If you comb through the comments that is an underlying theme. And it is true like or not, why chains in U.S. work.
My concern with your plan, is I would think before you even got into the restaurant you have a clear vision of what you want to do? As you can see by the responses everyone has an "opinion" about what would work, but if you, the owner/investor does not have a vision for your place before you open...well problems ahead. Especially, if you plan on serving food.
I think #1 about what you are going to serve is YOUR CHEF. You may have envisioned: Americana let's say, but your Mexican chef is more familiar with stuff he grew up on. So would make more sense to either have him prepare things he knows how to make and how they should be, or change your chef.
Other than that I think of what Gordon Ramsey (like him or not says): Don't have a bloated menu (this leads to a lot of waste $$). Have a short menu, of excellently done items, with FRESH ingredients. Don't be American style ("yes, we have 'fresh' berries in the middle of winter"). And have 1 specialty that you are known for: "chef Miguel's Grandmother's Amazing Enchilada Pescator", or whatever. Your signature dish.
I agree about the TVs. Either sports bar, or no TV. If you do Sports bar, do it right. Multiple Tvs, showing all sorts of games. Spend the money and get Plasmas, and different areas so people can watch various games and sports. The Alamo is pathetic by U.S. standards for a sports bar.
Good luck. I own several bars in the U.S. and a close friend of mine is a well known chef in BA, so if you have specific questions, please do not hesitate to PM me.