I don't know about that. Canada has a long and proud history of standing up and pulling more than its weight when the West goes to war. WWI, WWII, Korea, Afghanistan. The Canadians performed excellently in all these conflicts and earned the influence you talked about. But from these examples we can see that Canada's contributions have usually been on land. I can't think of a scenario where Canada would be fighting as part of a coalition and would be called upon to dispatch a bunch of F-35s. To contribute to collective defense, Canada should focus on having top-notch light infantry and the fixed/rotor wing assets to support them, and intelligence. America can handle the big expensive stuff better, but you can never have enough good light infantry.
By "West", I think you mean the US. Most people see Germany as a "Western" country
. But you see -- sorry if this is "political" but I can't help it -- in all these examples, it was NOT ABOUT CANADA'S INFLUENCE AT ALL! Rather, it has been about Canada's relationship with the US (and Britain, in the case of WW I).
I think Solarz's point, that nobody threatens Canada is correct, or almost correct. Canada has one neighbor, the US. And it has a near neighbor accross the Arctic. These are the only two powers who would be capable of invading Canada. Neither has tried, at least in quite a while, and it is obvious that the US, the stronger of the two neighbors, would not allow such a Russian adventure.
Because most of the Canadian population, and all of the East-West roads and railroads, are within a few tens of miles from the US border, it would be very easy for the US to cut Canada into little pieces, even without the overwhelming imbalance in military power. Up through WW I and probably beyond, this was seen as the reason for Canada's association with the British Empire.
Obviously, today there is a different arrangement, and a sort of "trust" has been established. My guess is that Canada is a willing ally in most of the major wars its southern neighbor has engaged in because, in a way, it owes its existence to the fact that the US never invaded.
Back to the matter of f-35's: it makes no sense at all for Canada to arm against the US! As to Russia, this is a far fetched scenario at this point, and as to 30 years from now, you would have to judge things according to the situation existing then, and not now (For example, it may well be that China and India, at that point, are the biggest powers on the planet). But yes, if Canada intends to continue helping its southern neighbor, then by all means, it has to keep up with the technological requirements of that. Pretty expensive to do, in my opinion.