Build your own drink mixing robot
I've always thought some kind of automated drink mixing system would be good for busy inner city cocktail bars.  You can still have a bar where people can sit and watch someone mix drinks, but the rest of the venue can be tables with table service.  The orders from the tables are taken by a person and gets sent to the kitchen where the drinks are made by machine.  This will retain the personal touch of people attending to tables personally, and allow them to serve drinks often, promptly and consistently.