I have played AL but I no longer do because it's not a system I enjoy, some because of the restrictive +1 PHB restriction some because I don't like 5e as much (although still enough to play it) some because my group that I played encounters with in a store became a home group where we play the hardcovers (Which we could do for AL credit like you can do APs and modules for PFS credit but for which I choose not to.)
I didn't intend for this to be a discussion on the relative merits of AL versus PFS, as I consider Paizo's OP to be superior to anything WotC has put out since Living Greyhawk (Which I consider the pinnacle of OP).
I will say that AL does have more leeway with regard to run as written which does mitigate some of the concern with metagaming but the scenarios still have an overarching plot and they have overarching seasonal plotlines much as PFS does. They also have convention created content that can span years and are huge draws where they are offered.
Now it could be a fair point that perhaps the crowd that is attracted to PFS would react more negatively to more open replay than the crowd that is attracted to AL, and that's potentially worth exploring but I was more using AL as an example to show that unlimited replay doesn t have to kill campaigns, it may be best to not adopt it but those reasons should be supportable on their own.