There will most likely be a shortage of consoles so it would be weird to sell with a big loss when there arent enough consoles in stores anyway.
Maybe, but by launching at that price based mostly on lack of availability, they almost have to maintain it until holiday 2021 then. If they don't have a price advantage, and think they need or should have one, waiting a year to drop the price could hurt them. Dropping it before a years time will probably piss a bunch of early buyers off, and they won't want that type of negativity early on either.
I don't think $499 is all that far off the mark to begin with, but if $499 is the price that makes the most sense, they won't sell for higher even if they think they could based on vast demand over limited supply during the holidays and new year.