For pilots a flow long term is bad. It will once again lower the DCI costs to where they were in the earlier part of this decade. Longevity will be reset as you flow to the mainline. That part is bad for the individual, but the lower costs of the DCI will once again promote a heavier push for more flying being taken off the mainline cert and put on a contract carrier cert.
Pilot are greedy so the ones that want to get to Momma DAL will see it as a golden ticket and not mine the effects it will have on the gander. That is what those who are a in favor of this are betting on. "I get to go to the mainline and not interview."
Long term it keeps DCI costs low, very low as in the next 20 years you will see over 9000 pilots leave the mainline.
Furthermore, what is more dangerous is a flow at some carriers but not all of them. It will then further drive down pilot costs as the other contract carriers fight to compete with in effect startup costs that these carriers with the flows throughs have. Again another form of self induced competition among pilot groups all performing the same coded flying. I am sure a MBA thesis could be written on this. DAL created it. From a management perspective it is pure genius.

It in effect plays off the greed factor.