Well after having my various groups over for one last time (NMRA, Tuesday, and Friday) the dismantling started yesterday. All the train room décor is down and everything has been packed away in its boxes. The track will come up this week and the upper level. I know people said to keep it up while building the new one but in the contract with the wife I have to build an exercise room for her first in there. Also this moves all the gym equipment out of the way in order to access the main part of the basement. As for spending the summer in the basement she works during the day so I don't mind that at all there will still be plenty of time in the early evening to get out and we always do things together on the weekends outdoors.
I have planned on expanding my aisle ways. The old room was set at 24" and there was a front viewing when you came into the room at about 36". The new design will have at least 30" aisles and the whole front will open to the other half of the basement which means over 20ft deep to get a complete overview.
I agree the whole social aspect of the hobby plays a major role. I would probably be happy with my old layout just running trains once in awhile but having found so many great friends over the last 2 years has made this aspect of the hobby grow in importance. Don't get me wrong I am not doing this for them but for me and my wife. She has really taken to the layout and is just as excited as I am.