The US is just a small fraction of oil use. There world will be consuming oil for many decades. Some by industries with hard to replace uses (plastic, planes etc), and some by backwards countries (US, Russia). But it'll just be a small fraction, so will be supplied by the low cost producers like Saudi Arabia. High cost producers like Alberta will be shut out.
Gas car sales peaked in 2018 globally. EVs are already >20% of new car sales worldwide, and the US is a joke when it comes to EV sales compared to Europe or China.