I was sure looking forward to the drive across Canada as a once in a lifetime experience. Flying up to Alaska and renting a vehicle wouldn't be the same. Have done that 3 times. I have an idea that most Canadians don't approve of shutting the border. At least non urban Canadians.
Just put the trip off for a year or so and save your money. With the fuel price increases that are occuring daily you will not a lot more money for fuel in a year or so.
The Alcan trip is nice but not under present circumstances.
drover