Ah, the Canada Civ Idea comes again from the dead...
This is a long rant, by the way. I apologize if I offend anyone, in advance. I'm somewhat sleepy as it is.
Thing is, they are just like Peru. Or Australia. Or Chile. Or Israel. As the Mod goes that is.
It isn't that they are irrelevant. It's just that they aren't relevant enough as to be put into the game. And that's coming from a Peruvian.
Yeah, sure, I'd love to see and play as my homeland in DoC. All that it would take is revamping the Inca respawn. Just as they did with Aztecs/Mexico, or Maya/Colombia (which doesn't even make any sense, considering that there were never any Mayans in Colombia; Muiscas were).
Peru has had its moments, for sure. Pedro Paulet, the first military submarine to be built in South America (the idea going back to 1864, a few months before the Confederate HL Hunley), the Peruvian Bolivian Confederation, the War of the Pacific, the first country in South America to successfully deploy paratroopers in war, the Guano/Saltpeter/Rubber boom, the War against Terrorism... The list could go and on and on.
But, just like Canada, on the great scheme of things; it just keeps falling short. Hell, in order to make Peru interesting to play, one would have to mod Bolivia and Chile into the mod (as I once suggested). Maybe even Ecuador. If not it'd be just a "Kick Spaniards out, settle jungle, avoid being conquered, grow economically and technologically, make peace with everyone, rinse and repeat".
We already have quite a bunch of those in DoC. And those that exist are fine, in the way that they get to cover some ground without going way beyond what is required to make them playable.
Tibet, for example. They are relevant enough to warrant an appearance during their era. Then they just fade away. But no extra civs needed to be created just to make them work. They have an interesting gameplay, even if they are a one city civ.
Peru would need 3 or 4 civs to be playable. Israel would need those too as well. Chile too. Alas, no way.
But Canada and Australia? Gameplay with them would be summarized in what I said for Peru minus the fighting part (excluding Natives and the odd encounter with the US, in the case of Canada).
So, would I like to see those Civs around? Yeah. I'd love to play as Peru, or as Canada. Hell, I LOVE Canada. But for DoC purposes, they don't fit the bill. Which is a pity, but then again, it is impossible to add everyone in the Mod; no matter how important they were.
There is a reason why the Harappans and Celts were made redundant, after all. :/