I expect this to be true. Sony is more willing to take a loss on HW, while I think MS is preparing for their xCloud/Gamer Pass future, so won't be quite as willing to take big losses on HW. The X kinda proved that. MS didn't want to take any loss, so priced it $100 more than the competition, even though it could have been their opportunity to mount a comeback. My guess is that next gen, they will be launching at the same price, $499, while MS will put enough into it to have a slight loss and Sony will be taking a $100 or more hit.
Of course, either way it turns out, I don't think the difference will be quite as big as the ~40% the PS4 had over the XBO. Which still equals a PS5 victory, with EU/Japan loyalty and many American gamers sticking to the PS family.
