I went with 10, but I'm going to offer the optimistic take that 10 could be on the low side. Hear me out.
For much of the first 2.5 seasons of the McVay era, we ran the same offense with mostly the same players (swapped out Watkins for Cooks, but other than that, pretty similar). Same with the defense.
On offense, teams started to sit on our routes last year, and seemed to have a much better idea of what was coming than they did in the previous two seasons. That was true even with the return of Kupp and the monster season he had. However, the 2020 offense is going to look much, much different than the offense of 2017-2019. Instead of Gurley, teams will face a committee that includes Henderson, Akers, and Brown. They will probably face a significantly great amount of 12 personnel than in previous seasons. I'm thinking in general there will be a greater variety of personnel groupings, and further, that McVay is going to do a lot of things different than he has in the previous seasons. That will restore the element of surprise that seemed to be lacking for most of the 2019 season. Because of both changes to personnel and to the scheme, McVay will re-seize the initiative in his battles with opposing DC's, and that alone should make our offense effective.
On D, there are a few more questions marks, since none of us has seen Staley as a DC yet. But I do like his approach to not be so wedded to a particular scheme, and take the more adaptive approach to defense based on the particular opponent. That will also give our defense an element of surprise they were lacking last year. I think the acquisitions we made in the offseason will help us with run defense, and hopefully we can avoid getting steamrolled like we did in a few games last year. And we still have Donald on the front end with Jalen Ramsey on the back end. In just about any defensive scheme, the presence of those two together on the same D is going to cause problems for an offense, especially on 3rd and long.
So yeah, I'll go with 10 wins predicted for now, with the caveat that I won't be at all surprised if it's higher. We have the best coach in the division, and he's coming into 2020 highly motivated with new toys to play with. Look out, NFCW.