Sure
And there are people who won't go Pathfinder because of Pathfinder.
It seems clear that no system is going to appeal to everyone and you can find reasonable stones to throw at anything.
So the relevant question is not "will someone find a reason to dislike this?", the relevant question is "How do we get a lot of people to like this for as long as possible?".
I think Paizo has demonstrated that quite well.
Again, by the number that you personally quoted, Pathfinder's 6-year-and-going existence blows away both 3E and 4E. So it is a model of success.
Pretty much everyone who didn't like 3E, doesn't like Pathfinder.
I know a lot of people who very much liked 3E and yet don't like Pathfinder.
It is easy to find people who don't like Pathfinder.
It is hard to find a game with a better template of success in the modern market.
Clearly these two things are not directly related.
And by the same token, it can't be said that PF's huge output is a reason for its success. It may be a big help, it may not. But it can certainly be said that it has not stopped it from being a huge success.
All that aside, I'd find it strange to see APs as a barrier to entry. You buy the ones that you find interesting and ignore the rest (with zero being a completely valid response). Same for all of the Golarion stuff. Just don't buy it.
The actual core game release schedule has been rather modest.
GURPS is, literally, built upon its splat books. To me personally, that is all the better. But I can see how that may turn others away. But if you see the same barrier for Pathfinder then you are not looking at it clearly.