PS4's year 4/5/6 are quite impressive, I don't see the Switch being able to keep pace with that unless some out of left field happens.
The PS4 Pro has definitely helped Sony be able to enjoy better legs in the back cycle of the product cycle, and their 15 million target this fiscal year is probably low balling it as they did last year. They just have a much broader range of franchise properties that are continually introduced because of the overall breadth of developer support.
You look at 2018 and 2019 alone and the PS4 got/is getting things like Spider-Man, Red Dead Redemption 2, Sekiro, Monster Hunter World, Final Fantasy VII Remake (which is basically its own thing), Kingdom Hearts 3, Devil May Cry 5, Cyberpunk 2077, Days Gone, Death Stranding as new franchise entries to the PS4 that late in the life cycle. Rather than having to rely continually on just GTA, FIFA, Call of Duty, Uncharted, Destiny, NBA 2K, Resident Evil, Final Fantasy (non-VII), Gran Turismo, Metal Gear Solid, etc. which have already appeared on the system.
Whereas Nintendo is going to basically have used up most of its AAA IP by the time Animal Crossing releases next March and then is going to likely have to double/triple dip into its franchise stable. Sony just has a much deeper pool of IPs they can draw on to keep sales high without having to use the same 10-12 properties two or three times and they have a Pro model which I think has given them a solid boost for the back half of their product cycle. That's tough to keep pace with.







