That's exactly what I am talking about.
Yes, it will take some time.
At some point East will have an obligation under the RLA to bargain with management. I never said it was today. But once that point is reached, and after going through the procedural steps, at some point if East refuses to bargain, terms will be imposed.
And I doubt under these facts it will take "several years" after starting Section 6 negotiations. East is showing its intransigence several years before negotiations even begin. They are building up quite a history already of showing a long-term "strategy" of having no intention to bargain and of being unreasonable towards the company. I am sure management is documenting all of it, and I imagine it will be very persuasive to the NMB, which management will run to as soon as they can after the Section 6 process has begun to have an impasse declared.
BTW, I think the long Section 6 route may actually be the worst-case scenario for management. Another approach could be that because East agreed to bargain in good faith to reach a joint contract quickly, that may have also created an obligation to bargain much sooner than the contract's amendable date. I would have to read the TA more carefully to see what else management can argue East agreed to. I have not had time to research that angle so that may be a long shot. But you can bet management is looking into it.