After seeing Days Gone doing 114k physical in Japan 1st week and what is doing in Europe. It seems like i am going to be correct (again) in what i said about Days Gone selling similarly to Horizon. Seems like 2'5-3'0M after 2 weeks is a lock now, and still can be a candidate to be a 10M seller in the long run.
It depends, it doesn't have the long lasting online presence of Horizon nor the (albeit falsely aligned) competition of BoTW. We were talking about how amazing Horizon was months after and there is still a huge twitter sub culture of posting photos and memes of Sony first party games that began with UC4 but went into overdrive for Horizon, Days gone doesn't seem to have joined these games in the same way, hell it isn't even close to what Ace combat 7 had goong the first few weeks. All that word of mouth marketing is pulled back to some thing like "it's not the best game ever, definitely doean't deserve some of the reviews, it's a solid 7/8 game." Where as horizon release in the high 80's and people were saying the MC was still low.
We'll see but I highly doubt it will be a 10mil seller even with 95 mil ps4s out there, perhaps if they fix all the performance and remaster on ps5 and it reviews better.
Everything in the above reply is my opinion, from my own perspective and not representative of reality outside of my own head!
-Android user, please be gentle with critique on my spelling.