And in the meantime, a high priority should be to add, perhaps double the number of ASW aircraft that we have patrolling. We originally had 33 Argus built. Granted they were slow but they had the ability to remain on station for a very long time and could cover one entire coast of Canada on a single patrol. In addition they were augmented by carrier based aircraft such as the tracker. Now we have only what ten, fifteen aircraft to cover both coasts and a fleet of ASW helicopters that depend upon our naval assets to be affective. There is no way that we can ensure that there are no subs within striking distance given these assets. To be affective deterrents our subs need to work in conjunction with a/c and, imho there should be at least one aircraft on each coast airborne and armed at all times whenever geo-politics get tense (like now). Aircraft can be purchased and put into service in a reasonably short time when compared with the lead-in time for a sub purchase. We need new subs, yes, and we need them soon but we need the a\c now; then argue about the best sub for the job. (To clarify my position, I do not have a military background so I could be totally out to lunch but, then again, what if I am right?)I sadly agree that Canada getting SSN's is not really plausible due to a lack of political will. I'd argue that it would be possible IF there was the political will to do so.
Others have already commented on this point and I'll just add my "ditto".
Nothing that could not be overcome with the political will to do so, but as noted above I agree with you that that will simply does not currently exist.
I agree that this is the likely course of action due to both political and financial constraints. However, this is where I hope some serious questions are asked before we proceed. Even with the best case scenario of eight subs (doubling our current fleet) that still leaves us with just four subs per coast.
Is that enough subs to be worth the cost in comparison to other capabilities? How many of those four subs per coast can we realistically expect to be able to maintain on station during a conflict considering the vast distances we need to cover? What is their detection range of enemy subs using passive sonar? Obviously the actual distance is highly variable depending on a whole range of conditions (and of course classified), but from what I've been able to find online it's likely less than 10km against a modern submarine at patrolling speed (please correct me if I'm out to lunch on this as this is obviously totally outside my lane). Relative to the size of our maritime domain that is basically nothing. Of course we would have other assets (both Canadian and allied) narrowing down where we should be searching with our subs but conventional subs are limited on how far and fast they can go while remaining undetected themselves.
Clearly there are things that subs can do that no other platform can do and there are things that subs can do better than other platforms, but I'm just suggesting that smart people need to look at whether at a certain point the limited number of subs we're able (willing) to afford makes their comparative advantage over other options not worth their cost. How many P-8s, Corvettes or USV/UUV's equipped with towed array sonars (or various combinations of these platforms) could we have for the same cost as those 6-8 conventional subs? Which combination best meets our military needs? Maybe the correct answer IS 6-8 conventional subs but sometimes I get the impression that we're just wanting replacement subs (and hopefully more than we currently have) because obviously subs are good and we want to have them - not because a critical analysis of our military requirements has determined that X number of conventional AIP subs best fulfills those requirements.