I doubt it's going to displace a large percentage of the rotary craft, unless they do it for political reasons (wouldn't be the first time--see also the Shuttle program at the beginning).

IMO, the time on site isn't the issue. It's transit time. It's guys under fire, or in bad need of support, and the difference between the help getting there in half and hour or fifteen minutes. Believe me, if you're under fire, fifteen minutes is a long time. Being able to fly fast over territory at an altitude too high for easy pickoff is also kind of nice.

I don't know how durable this thing is under fire. Some rotary aircraft are remarkably robust, but I don't have much more information on this one.