It isn't the opening I am worried about, it is the rapid growth.

They are going to shrink surrounding bases to staff BNA. Some of those bases have captains and first officers hanging on to the bottom of the list. Yes, there are plenty who want to go there, but it isn't like they take a systemwide survey and pull those people from whatever bases they are in. They do it based on the flying they are moving to the new base.
This accelerated ramp up means that they will be cutting those bases rapidly vs slowly. I don't think the captain side will see many (if any) displacements, but it's possible if they cut from the wrong places. They could cut places like ATL and MCO in big chunks which would have a drastic effect. There is a ripple effect as displaced pilots start hopscotching and displacing other pilots junior to them. LAX was small (still is really) and it resulted in a lot of churn and displacements.

Again, I appreciate that we are getting a new big base in the south. I think it's great. I just don't like that they are staffing it the way they are when there is limited hiring. It is bound to create some negative consequences. Not all the potential BNA pilots are going to be from the bases where staffing is reduced. Also, it is a fun discussion to have, but when the rubber meets the road, a lot of those pilots with BNA bids may change their minds based on reality.