I'm not convinced by practicality the tilt rotor concept, except for a few specialised roles and to my mind, Dave's idea looks more likely to have universal appeal.
However, as far as day to day practicality goes, any "side by side" rotorcraft comparable to the "main rotor/tail rotor" I fly (by that I mean fuselage size) probably wouldn't fit in a number of certain important landing sites we use. Unfortunately I can't see myself ever getting to operate one!