Marine Gunship and dragonfly?

Here's a question-- I've read some theories that the marines will
eventually need a new gunship to escort V-22's. Many of these involve
a AV-22 style design.
But my question is this-- as I understand it, the V-22 is very
ineffecient and unmanuverable in VTO mode-- it's not a helicopter that
flies as fast as an airplane, its an airplane that spends most of its
time in horizontal flight, and only uses VTO for short periods-- it
cannot behave the same as a helicopter.

But the X-50 Canard rotor/wing seems to be able to function as both
a fullly capable helicopter and a fully capable subsonic aircraft.
Wouldn't it make more sense to try to create a gunsihp version of it?
Now, since I'm not an engineer, could anyone tell me if there are
any problems with teh design that make it unsuitable?