I would think ALPA wouldn't be to happy about DE commands for reasons we all know. The only way it will happen is via the contract and only if NO F/O was even close to requirements.
Well, we'll see. There is at least an outside chance that ALPA will get in step with the real world... an airline like Eagle needs a solid base of experienced skippers, and if you have to hire a bunch of DE captains to get the experience base up, then that is what you do. Well, it is if you are committed to safety, and not some outdated, ill-conceived "seniority" system.
The idea that you protect the career progression of F/Os at any cost is out of the HR ark. Besides, those very F/Os will be the first to stab Eagle and the back, and head off to a bigger carrier.
The rest of the world realised, a, long time ago, that you need a stable core of experienced, committed captains in your company. If you have to hire them from outside, then that's what you do.
Not that many would probably want to go there for that sort of money, but still...