If the EBA sells out new hires, then the following will occur:
Potential new hires will seek employment elsewhere.
F/O's can't be released for command training due to F/O shortage.
Fleet expansion grinds to a halt.
Any current F/O's would be mad to vote for that deal.
It sounds like a similar deal accepted by LH Cabin Crew and it has Oldmeadow's fingerprints all over it.