Here's an interesting interview with the RCN commander regarding the increased costs. He's talks pretty candidly about some of the RCN procurement issues.
Warship cost could rise to $30B, Vice-Admiral Mark Norman confirms - Politics - CBC News
It does look like the 2 billion figure is acquisition costs alone in the revised estimates. Back in 2008 the CSC project was pegged at 26 billion (total program cost) of which 14 billion was set aside for acquisition. As the commander points out in his interview that was a long time ago... and the people doing the estimate didn't really know what they were doing.
The Liberal government initially had committed to 15 ships, but you can get a sense that they may start moving away from that commitment with these revised cost estimates. Now the question seems to be how many do we
really need or what's the bare minimum... consensus right now has that number around 10-11.
The other issue that's being looked at is capability. I think initially these ships were planned with 32-48 cell VLS. I've also read in older publications showing the ability to embark up to 2 Cyclone helicopters which would require a pretty big hangar / mission bay. If capabilities are now being reviewed there may be some scaling back in these areas.
Personally, I would sacrifice or scale back the air defense variants (which are the first 3 ships that are to be built). The more important need here is the command / control capability that traditionally comes along with these ships. With improvements made in modern radars GP / ASW frigates are not nearly as vulnerable or dependant on escorts for airborne threats as they may have been in the past. In my opinion (pls correct me if I'm wrong here) it seems the only major capability offered by modern AWD over regular surface combatants is in the BMD realm which isn't something our current govt. would be interested in anyway.
If we design these ships around a ASW hull; we could make the first 3-4 versions without all the advanced ASW gear which could then free up the room required for the command / control function. I think, in my very amateur opinion, that this could save a significant amount of money instead of trying to build a more traditional AWD sub variant for the first 3 hulls in this class of warship.