While normally I'd love to whip it out and participate in the pissing contest, honestly, the only real question here is: why? Just because MS is now going to have the most powerful console doesn't make Sony obligated to push out a new console in 2018. They have a console that will do a reasonable job on a 4K display, even if it requires upscaling or checkerboarding more frequently than the competition. It has HDR. Game software isn't going to advance in a year or two to the level that obsoletes the Pro or even the base XB1, which is the least powerful of this hardware gen. It doesn't make business sense to get away from the profitable tail of the generation to push into the low margin early adopter years, it dramatically hampers the efforts to continue to make money from their sizable install base, and it certainly wouldn't engender fan goodwill to ask them to pay for yet another new console.
It's just stupid.
Please feel free to assume the "It's just stupid" is my standard response to 95% of the thread, incidentally.