Many new trainees won't have an ATPL. It seems unlikely that Q will offer a free ATPL flight test to anyone except as part of a command upgrade. At this stage many long-haul jobs specify ATPL as a minimum requirement.
Therefore, at this point, the presence or absence of an FO training bond is largely meaningless. Market forces will keep FOs in place for a few years, until "ATPL" disappears from jet job requirement lists.
However, even if 100% of new hires intend to move on as soon as possible, I won't vote for reduced conditions for new hires. Rather than that, I'd abandon the union altogether and negotiate my own deal. It seems more honest, somehow.