4 feet for 2 people? What's your daily pie intake?
I understand your need for room no matter how and where you intend to use it, but how are you supposed to store that away easily? You really won't need that much space - trust us on that one, but if you are using them sitting down (perched in front of a TV or something) then you may do better to use two seperate ones if you want elbow room. It's a different story standing up at a dedicated cabinet as there aren't knees, elbows etc. sticking out as much. Measure ana average cabinet and you will see dedicated machines managed two players in much less space without cramping.
I've played two players comfortably for hours on one of our upright machines, which has a control panel width of just 21". Even our bar-top at 16.5" wide is comfortable for two for shorter periods.