1) Nintendo games always have massive legs compared to the vast majority of other studios (Minecraft and GTA V being rare exceptions). Long term I doubt there is any way TLOU2 beats ACNH.
2) UK and the rest of Europe are Sony lands, whereas Japan is absolutely Nintendo and USA is split, so this isn't indicative of what the rest of the world will look like necessarily.
3) Even if the game isn't my cup of tea, congrats on the success and I hope it's fans enjoy the game. I personally could never enjoy a zombie game. I don't want to be scared, grossed out, or horrified in any way when I play games. I want to ESCAPE life's stresses in games, not have more thrown at me, but that's just me and how I deal with my anxiety.