I think there are many of us who were initially surprised that a civilian tilt-rotor failed to emerge but .. I have to say, once you consider the reason why, (cost) it isn't entirely surprising.
My personal view is that the X2 concept as envisioned in the form of the
Raider is the most viable platform for enhanced performance VTOL ops where an increase in cruising speed is the desired objective.
Should a form of this craft one day be offered to civilian buyers I am sure it would make a fascinating (albeit initially expensive) alternative to some of the types we are familiar with.