Canada didn't forget anything. We have a diverse economy with common sense measures like reducing our net debt to GDP, while keeping a fully funded retirement pension fund (CPP, unlike SS, actually invests in the public market). Even the way we do provincial transfer payments is sane. While one industry is booming (Oil, manufacturing, tech) other "have not" provinces get payments through the federal government. This…
Look at the allocation of value on the stock market. Overwhelmingly oil and gas despite that being a rather small part of the economy. Look at the allocation of most mutual funds that a Canadian owns as part of their retirement portfolio. Look at the nature of the previous gov'ts budgetary and economic planning (in as much as they did that kind of thing). Overwhelmingly in favour of the resource sector.
You seem quite married to this simplistic thesis that oil is Canada's downfall, but "just look" isn't an argument. I looked, and the non-oil economic output continued to grow through the oil boom, just not as fast as the oil and gas sector. Yes, oil was a temporary boost, but the country isn't any worse off than if it hadn't extracted that oil. By the way, the government does not enforce oil production quotas in Canada. The fact that the world oil price soared above $100USD causing massive production increases in Canada was not an economic policy of the Canadian government. That's the market economy functioning, not central planning as you imply. The government didn't peg the CAD to world oil prices, the international currency markets did. NOT producing oil in the highest price environment in the history of the world would have been an economic loss for Canada.
Furthermore, the last government, like the current one and every Canadian government in living memory, gave billions in handouts to every sector of the economy, especially manufacturing. The federal government spent billions balling out the US automakers in Canada. Yet manufacturing has been declining since the 1990s, long before the current oil boom. Have you seen a chart of labour productivity in Canada vs. the US and Mexico over the last 20 years? We're a high-cost low-productivity environment and not just because of a high dollar. Having actual social security programs and higher unionization rates places a big, structural role in failing to attract and retain manufacturing capacity within NAFTA.
It's puzzling that you think the oil production boom in Canada was caused by the Canadian government when production was booming in every petroleum producing country in the world because of high global demand. It's even more puzzling that you think the oil boom of the last 10 years and the supposed policies of the last federal government account for global macroeconomic trends that have existed for 20-30 years.