The fact that there are going to remain two certificates creates other downline issues. 1) Pilots WILL be assigned to either the PO or 5Y certificate.

So when you do that, should you choose PO, you will belong to a 6 jet fleet flying the Asian shuffle. If you bid 5Y, you will fly the same 5Y flying as now. 2) What happens when a furlough strikes? If 5Y reduces flying, and the most junior pilots are on the PO cert do you think JC will furlough the Junior pilots and issue a new system bid with countless training events, or are the more senior 5Y pilots going to get the axe?
These are more issues to be defined in any SCBA. There really needs to be ALOT of strategy and foresight whether there are separate CBAs or a BSCA, err, SCBA