We will need more. But like I said these kinds of lists. X ships, y tanks, etc come from a mindset where we simply had to construct a task group to throw into a fight. 15 Rivers, a dozen subs and a dozen CDCs won't mean a thing without the space capabilities to find the adversary for example.
A truly sovereign military means having all those enablers that we usually expect the Americans to bring. And it means the whole spectrum and every domain from orbit to seabed, to the spectrum to the information domain. It's a world where having SIGINT aircraft may be more important than a few more destroyers. Or simply having more ammunition stocked up maybe worth more than dozens more fighters or tanks.
Consider a basic scenario. China-Taiwan heats up. The Americans tell us we are on our own in the North Pacific while they send everything they have to the fight.
All of a sudden 15 RCDs and a dozen subs and a dozen Corvettes and 16 P-8s doesn't actually look like a lot when split between three coasts. You still have to guard the Arctic. In fact, you might have to do more. Those P-8s? They might need tens of thousands of sonobuoys to sustain that kind of an effort for months. We really don't stock like that today. And as their fight gets frisky do we have enough space assets to self-sustain while more of theirs are repurposed to the fight they have. We still have to do all the NORAD stuff and now have to deter any sub or containerized missile taking a shot. Do we have enough tankers to do all that?
When this all kicks off you have other considerations at home too. The economy will obviously go to shit as global trade collapses. How vulnerable is the population to misinformation and who manages the information space to ensure the CAF can focus on its mission? Who will protect from attacks on infrastructure at home? Who is going to stop drone attacks at the GDLS plant in London or Pearson airport? If we're restricting airspace how does the CAF work with TC? And all of this while we consider mobilizing to deploy our own forces forward.
In the scenario above, every Arleigh Burke the Americans have to give to a Canadian Admiral to patrol the North Pacific is one less that they have to help Taiwan. Every satellite they have watching the Arctic is one less in their primary theatre. Etc. The minute you say, "don't count on the Americans," the scope of the work we have to do gets massive. And this is a moving target. The threat on something like this is different in 2030, 2035, 2040, etc. The checklist mentality of inventory numbers has to end. No more, "We have x amount of this. We're good.". The question needs to be, "Can we do the mission without the help of allies who are distracted?".
And that is going to take an all of government approach. And genuine cooperation between the services. TC will have to work with the CAF to ensure air defence can work with airspace restrictions. CSIS might have to rush clearances for personnel so they can get to work. Maybe the PMO has The PM do a daily presser so that the AI videos on Tik Tok aren't changing public opinion against us. The army will have to learn to use HIMARS to do coastal defence. The air force may have to throw anything with a sensor into the mission to help the navy from a Kingfisher to an MQ-9. Maybe the navy pays fishing boats to tow sonars. Etc.
This is the kind of effort 5% of GDP is meant for. Not just moving up the stat count of our contribution.