Agreed.
The only difference we'd have is that there'd be less clusters of the exact same things being promoted on a multitude of threads. The average promo poster will come in, spam post on 4 or 5 different threads the exact same copy/paste, and then leave. All 5 of those threads are then sitting at the top of the forums. So you go in to see what's available and in every thread it's the same mess of the same posts. It's a headache and just totally redundant.
We'd still have a sea of threads of promotion, but if it's single-title based, we won't have the issue of duplicates, and instead of having to scour a post full of a billion promos for anything interesting, we can more easily scroll thread titles for interest.