So what happens when the senior pilot leadership of the new in-house union (which very well may be similar to the current leadership) decides to sell scope again? You gonna decertify the newly certified union?
Sorry, I'm not in the airline game anymore so its not really my sandbox, but everybody gets SO angry and immediately points their finger toward "ALPA" when its a failure of union leadership that's the problem, not the union itself. After all, a "union" is, by default, a collective of employees negotiating together in UNITY.
...and its hard to have any semblance of a real union without any real unity, be it at the local or national level.