All resource extraction was less than 10% of the Canadian economy in 2014, smaller than manufacturing and real estate.
I don't really have a great picture of what parts of the economy drive properity, but while I can see that healthy manufacturing can lead to everyone having more stuff, I do wonder how "real estate" enters into it. Real estate can change hands, and go up (or down) in value, but nobody is making any more of it, so having a healthy real estate "sector" would seem to be more of an indicator of prosperity rather than a creator of it.
In any case, if you have any links you can share explaining that resoure extraction isn't such a big deal to Canada I would be interested in learning.
It does seem like oil is Canada's biggest export (about 27% of the total). Vehicles are #2 at just under 13%. Combined with Precious metals (#4), Plastics (#6), Wood (#7), and Aluminum (#9) that makes up about 39% for "resources", while the Vehicles, Machines, Electronics and Aircrafts add up to about 25%, so it looks like "resources" are significantly larger than "manufacturing" on an export basis at least.
One can see that dropping the price of the biggest export by 70% is a pretty significant event. All other things staying the same one could imagine oil going from number 1 to number 3, droping the overall export total by 80 or 90 billion dollars, or around 20% of the total.
These look like 2014 figures:
1 Oil: US$128.6 billion (27.2% of total exports)
2 Vehicles: $59.7 billion (12.6%)
3 Machines, engines, pumps: $32.6 billion (6.9%)
4 Gems, precious metals, coins: $20.3 billion (4.3%)
5 Electronic equipment: $13.6 billion (2.9%)
6 Plastics: $13.2 billion (2.8%)
7 Wood: $12.7 billion (2.7%)
8 Aircraft, spacecraft: $12.4 billion (2.6%)
9 Aluminum: $8.9 billion (1.9%)
10 Cereals: $8.7 billion (1.8%)