The price will depend on how much each company is cool with to lose on each sale. The hardware in those consoles is way more expensive than the prices you suggest...
Yeah I was taking into account the loss per console. You also have to consider how much they can charge though. Consoles have a certain price range in people's minds. I think the next generation consoles will be more expensive, but not to the point where the consumer is paying standard prices per each piece of hardware in the system.
I also think Microsoft (and maybe Sony) will take a page from Apple's playbook and offer a monthly payment system. Something to offset the higher cost. If an Xbox Series X is $599 but you can order it today for $49.99 and then pay a set rate each month, then I think it's an easier pill to swallow for a lot of people.