I doubt it though.
The baseline has dropped considerably compared to last year, and it's only due to the flurry of great games throughout the year that it sold so well, as each one of them boosted sales enough to get close to last year's sales. But next year the baseline is certainly even lower, and the outlook in terms of great games looks much weaker to me than it did this year. While I'm sure PS4 will come with a pricedrop (50$, I don't expect Sony to permanently cut 100$ just yet) and maybe a superslim (that one really depends on sufficient 7nm yiels and capacities), I don't think that will be enough to keep the sales going that well. It will still do well, but I don't think it can still do 15M+, more like 13-15M
We'll have to see if Dreams and Days Gone are really the only games that will come out next year or if Death Stranding/Ghost of Tsushima/The Last of Us 2 come out (not all of those, but maybe one or two of them)