I assume you're talking globally in the USA? It's certainly out of the question world wide, given Xb one has 0.00001% chance of outselling PS4 worldwide in the holidays, this year or any year after that, with the possible exception of a holiday year after the 9th gen starts, if there is one.
If you are talking US only, then clearly, yes it is possible of the Jan-Sept sales gap is relatively small. Has anyone actually said for the USA that Xb one cannot possibly have a winning year based just on winning Oct-Dec? Of course it can happen, but it will probably not be a big enough whole of year win to erase most of the LTD difference.
If they don't do it this year then I don't see it happening any other year that matters. Also recall that Xb one did win April NPD, so if things go according to predictions it will be 8 to PS4 and 1 to Xb one.
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