Well, technically Wright, which had been around for decades, was superseded in large part by the Five Party Agreement, which hasn't been around for decades, unless you use WT Math, and then it has spanned two decades...
This is nothing more than a property dispute. We have is a political appointee trying to redefine how the terms of the master lease are to be interpreted by the City. In short, her letter is telling the City that they can declare eminent domain over WN's sublease.
I've posted the Scarce Use Provisions enough time that I shouldn't have to do so again, but the short story is that the signatory carrier's rights trump those of a non-signatory carrier. Nowhere in the SUP's does it state that the City can infringe on a leaseholder's ability to use their property within the terms of use.
I'm sure some DL fans will try to project this as an opportunity for the courts to invalidate the Five Party Agreement, but I don't see standing for the court to go there. WN didn't open that door and request a ruling on that law. All they're asking the courts to determine whether or not DOT has the standing to redefine the terms of the master lease agreement.
The only danger I see in all of this is the risk of the court ruling that VX and WN don't enjoy the same protections over their lease that WN, AA, and UA enjoy as signatory leaseholders. Signatory rights don't normally flow through on an exclusive sublease. That would require the City to craft something aside from the SUP, and that could get messy.