The problem is that there's very little data available on what the pension is actually going to cost, once all the buybacks are sorted out. Thus far, from what I recall reading, the buybacks have been close to the 50:50 sharing that's the long-term target for all government pension plans. There are also very few folks retiring with significant part I.1 pensions so far, so there's still a reliance on actuarial models vice actual data.
My personal opinion (unsupported by any secret background information, leaked documents or personal interviews with Treasury Board staff) is that we will see some increases over the next few years; if interest rates remain low, I suspect we'll see contributions creep up.
Doing a very quick and very dirty spreadsheet, I'd estimate that if the plan is earning 2% returns, contributions would need to grow to around 7%; if the plan can earn around 3.5%, the plan is probably sustainable at or around the current contribution rate. While that sounds low, keep in mind that the plans maintain a large balance in low-risk investments to pay current retirees, which depresses overall performance compared to some market indexes.
[soap box]
Ideally, the CF wouldn't have two pension plans at all, but would rather see Reservists contribute to the Reg F plan, and only vest in that plan once they have 730 days of CF service* (that is, two years - just like any Reg F member). Administration would be greatly simplified (and costs reduced); portability between Reg and Res would be automatic; and support tools would be usable by all CF members.
There's adequate legislative cover to do such a thing; all that's lacking is the will.
[/soap box]
*CF Service, as defined in the Canadian Forces Superannuation Regulations, is calculated for Reservists as One Day of CF Service for each day worked on class B or C service, and One Point Four days of CF Service for each day worked on class A service.
