The tiltrotor is a specialised role machine, optimised for high speed / low volume transport rather than high all-up mass / carrying capacity. It has relatively severe handling limitations in the low speed envelope when compared to a helicopter. Because of the very high cost, it is most unlikely it will ever have as large a market as the helicopter presently enjoys.
Rather than have a squadron of these, why not just use a large helicopter and set off a little earlier?
