If at some point in the future vets are so numerous that they completely block out all non-vets from being considered, then I'd consider a change in policy. Right now, that just isn't even close to the case. It seems like vets do block some of the panels...but probably not most...and definitely not all.
Experience still does matter in vets vs. non-vets. If a vet is just a vet with a BS met degree..he would not make GS-09 grade. Therefore, non-vets at GS-09 would still be considered on equal footing to a vet or vets that were referred at GS-07 and GS-05. The MIC is not required to choose a vet in a case like that.
For example, I was referred to Spartanburg, SC and Charleston, WV at GS-07 and GS-09, but not at GS-05. Vets were qualified at GS-05 so they were referred, while non-vets at that grade were not. Gold candidates at GS-07 and GS-09 were referred to the MIC.