Dive bombers were invented when there was a need of delivering the ordnance with more or less pin point accuracy, as opposed to carpet bombing. They became kind of unnecessary after air to ground rockets were invented and bombing accuracy improved by courtesy of advanced sights and (later) computers and smart weapons. That's why we don't see them anymore; their niche has been taken by other things.
<\SOTR MODE>
That said, the idea is definitely orky and would appeal to their mindset. However, the dive bombers should be very poor in air to air combat with possibly an orky chance of becoming integral part of the landscape as Jimbo already suggested.
Ok, Vanvlak, now you'll have to make "BigGunz" Roodelz stooka skwadron...
