I agree with you. There's no way I'd even think about having only one "plane" to fly. It's a silly investment, IMHO.
I think if we can do the simulator virtually by Oculus Rift would be better. Magic gloves with feedback tactile sensation can let us switch on/off all the switches and buttons. The gloves give us the feed back tactile sensation on our fingers or our palms when you put your hands on virtual yoke would be perfect. I can change to any type of airplanes, or even switch to a racing car with a stick or paddle shift. Moreover we can add motion platform with it to make it more real. I would love to have those more than a fix base 777, 737 or 787 which you cannot change anything after you decide which model you want to fly.