You might want to read this article. Car and driver tested the car right along side a Model S Long Range Plus with 402 EPA rated range. When the Model S went into limp mode at 357 miles, the Air still had 20% capacity left. No, that's not over 500, but it is in the neighborhood of 460 miles at highway speed. That is still enough for most people's drive in a single day.
Lucid Air EV Has a Projected 517 Miles of Range
That is an impressive achievement and it shows where the state of the art is going. As electric vehicles start consistently getting over 400 miles or real world range the advantage of the supercharger network will diminish somewhat, but people will always need a way to charge and I can't imagine someone paying that kind of cash in 2021 not to be able to drive anywhere in the country without thinking about it.
The other issue worth noting is that Lucid is a brand new company. How long will it take them to ramp production to a meaningful level? We have all just had a ringside seat of what that looks like...
Finally, the obvious, by 2021 Tesla will have longer ranged vehicles available.
Quick question for the group, has anyone put together a comprehensive timeline of progress on the Model S? What I am looking for is a chart that shows the dates of availability for each new longest range variant. Bonus points if it includes maximum supercharge rate.