Don't despair wobblyprop
The numbers for next year are high. 90 Pilots or so and since Direct entry Captains are far from being the majority, I would say you stand an even better chance than you might think.
As an SO you will be able to join on the 73 but also on the 75. As a a Captain, only on the 73.
And with Terms and Agreements now simliar or both fleet, more and more existing FOs will bid for command on the minnie.
In any case, it is all good stuff whether things happen now or a bit later.
Good luck