BBB
Um...you'll find, in the very near future, that as the first of our "zero to hero" types approach the top of the S/O list, that promotions will be merit based. The GMT has already decided that this will happen. You should know that CX doesn't respect seniority in any case. It's whatever is expedient (and saves money).
Expect DEFOs as well, as the upgrade success rate slows. We all know that CX will do it again.
There WILL be bypassed S/O's, and a lot of them. Having flown with a bunch of them on both sides of the competency/experience scale, I'm loath to admit that I agree with this move.