Norway is already an extreme outlier in terms of both new and existing EV’s, which is included in that global number I mentioned. I expect several countries will break that 30%, but oil is a global commodity.
As to 80%, 2030 is only 6.5 years from now. You can lookup the rate companies are building factories to estimate the maximum possible adoption over the next 3-5 years and based on that 80% globally in 6.5 years is completely off the table. Also, adoption is dependent on what people actually buy which will slow thing down from the maximum theoretically possible. S curve to 50% which then slows down is common because not everyone’s needs are the same which feeds back into how much manufacturing capacity gets added etc.