We've long pushed for 2 engines - which has made sense in the past. Even a successful ejection over the vast arctic would basically be a death sentence. Though some of our allies don't seem to have the same reservations, and it seems modern engines are a lot more reliable - certainly the F-35 only has one, so it looks like we're ok with it now.

The modern F-18's and the new F-15's would have also made sense, but agreed that modern F-16s would seem to be a nearly perfect fit if a single engine is now deemed acceptable. Given we like to keep equipment for as long as physically possible (and then some), the F-35 might have more runway (rimshot) in that regard though.

The F-16 lacks the range to operate effectively in Canada. They would need to load it up with multiple conformal or external fuel tanks, which wrecks performance, and would still need extensive tanker support.