Is it possible that Ninja will do more dps than Monk?

[Pylfer]

Having the ability to increase party damage on the mob by 10% wont that make them so desirable that it will make people want to have a ninja in a static rather than a dragoon? So it seems like dragoons may be thrown to the side and not needed.

Depends on the damage they deal. If it's laughable (and they turn in more a support class relying on TA and Goad and what not) then there may still be reason to take a DRG for the consistent spike damage. However, if they can maintain 350+ DPS average in fights like T8 may give them an edge because even though there is a loss of about 50-100 DPS AVG from dropping the DRG, you'll make that up with the other DPS, yourself, the tanks, and the healers when they DPS for that brief period, more than enough damage to compensate for it.