Can't predict the future, but there are a couple of things to keep in mind.
It's the June/July 2018 new hires that are hitting the line now, in March of 2019.
There are something like 125 first officers in training. If we don't get additional airplanes, we'll be very healthily staffed by mid/late 2019, which means a larger reserve pool, and more time spent on reserves before holding a line.
Assuming things stay the same, anyone hired today is stuck behind a relatively large group of brand new FOs. What's true today for reserve FOs (hired in Summer 2018), is very likely to not be true when today's new hires hit the line.
Unless things change (we see more airplanes and growth, again), anyone hired today has a real possibility of being stuck at very low seniority for quite some time. They'll be at the worst place you can be, the tail-end of a big hiring wave, at an airline that's no longer growing.