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To "extract bitumen" appears to mean mine tar sands for hydrocarbons.
I expect demand for mined oil to decline to the point where only the absolute cheapest producers of it will be able to stay in business. Extracting from tar sand will be right out.
When we have no need or desire to oxidize mined hydrocarbons for heat, our remaining demand for mined hydrocarbons (e.g. to make into plastic) will surely be less than today. Then, the most easily obtained natural hydrocarbons will be the ones we mine, because we are not wasting them by oxidizing them to CO2, water, and heat.
Unless there is no bitumen dissolved in that readily obtained oil?
It is just possible that hydrocarbons made from gathered and cracked CO2 will end up cheaper than fractions of extracted oil. But I have doubts.