Personally I do not see the AIP fixing the problem at United. WB FO looks too attractive by comparison.

More flexibility for junior NB CAs will fix it.

Ability to bid for (and be awarded!) fewer reserve days and a lower guarantee, but add the ability to pick up on days off.
Ability to bid for (and be awarded) lower LPV for junior lineholders.

Put another way, if Jr NB CA can have similar time off as WB FO, the attraction goes way up. A more satisfying job, fewer time zones/backside of clock issues.

It might be frightening to implement such changes as they require additional manpower.... but mark my words: It will fix the problem. If you can choose the right balance of time and money, doing a job you enjoy, life is wonderful. But a fat paycheck for too much of a grind..... we are seeing the results of that today. Attitudes to work and life balance are shifting.