By Daniel Kline MGM, Caesars, and the other Strip casinos are listening to a very big idea. The south and central sections of the Las Vegas Strip have become a mix of vehicular gridlock and pedestrian confusion. It’s not really a street that’s walkable — at least not without a lot of interruptions. Only limited stretches of walkways are clear; instead, the sidewalks are broken up with escalators and skyways that make it possible to cross various side streets. For pedestrian, it takes a lot of effort to get to most places on the Las Vegas Strip, and crossing the famous road has become even mor…