Good question, let's ask our Defense Minister (our highest military rep):
http://globalnews.ca/video/2527074/l...placing-cf-18s
They're not ruled out, but their purchase is not guaranteed - we do need a CF-18 replacement - but we don't think we need stealth capability: and that's part of what tacks on so much of the F-35's cost.
I think that the USSR is broken up, China is a major trading partner unlikely to declare war on us, and lacking the capability to invade/occupy.
I think we have a bunch of depots in the wilderness because of the Red Scare - from days long past - but Russia isn't Red anymore: and the idea that they would forcibly invade even back then was 99% anti-Communist propaganda and 1% reality. The USSR grew by influence, and by projecting the appearance of strength - they had difficulty holding small neighbouring satellite countries - occupying Canada across the sea was never feasible, and is not feasible.
Maybe that calculation changes in 5 or 10 years, and we need to start thinking about it more seriously - but China/Russia invading Canada in the next 10 years is not a thing.
Which leaves us with the US - the only people actually able to invade Canada. If it comes to that, are you saying if we buy a couple dozen F-35's, we will successfully defeat US air power?
If not China, Russia, or the US - then who the hell are we defending ourselves from? Is ISIS going to attack us in hot air balloons? Are we about to be invaded by hostile aliens, who are inexplicably vulnerable to our superior dogfighting skills and chemical-powered jets?
If we're not buying it for actual defense of Canada's sovereignty - then there is only one reason we're buying them - and that's to bomb people overseas like ISIS. Which, if we want to do that (and most Canadians want no part of it) - we would be better off buying some bombers / drones for pennies on the F-35 dollar.
I'm saying our role in NATO should not be joint strike fighting - I don't think that's our expertise or a capability, we're particularly known for, or have even something we have much capacity to do: relatively. If all we want to do is bomb Raqqah and cities like it, we could bust out some damned Zeppelins and have significantly more lethal capacity.
I don't see the point in buying overpriced stealth strike fighters of questionable functionality, to hide our true intention of using them to bomb Whereveristan. If that is the true intention here, then our requirements are radically different than an F-35 (what we need is Zeppelins). If that is our true intent for the F-35, and we phrase it that way - then the support the F-35 would get in Canada would be even less than it does already: because Canadians by and large, don't like our involvement in bombing.
Oh noz! The US will maybe beat us at dogfighting for a few years
No amount of arming is going to make China/Russia fear Canada. We could have more arms than Kali, but we still have a total population about the size of Tokyo.
Our military strategy has to match our capability. We're not the Space Marines, we're the Eldar - diplomacy is our greatest weapon. The rest of your post is just fear/insecurity.
So I said we should delay 5-10 years, and your whole point boils down to, "No, it will be in 4 years!"?