Winchester Township cannot afford to keep its several small branch libraries supplied with a wide selection of current books.
Conclusion (thus)
Winchester would better meet its residents’ needs by closing its small branch libraries and opening one larger, well-supplied library.
Evidence
If the branch libraries were closed, then Winchester could afford to open one large library that carried a broader and more current selection of books.
Evaluate
We have a Plan (close the small libraries and build one big one) and a defined Goal (better meet its residents needs). Since this is Weaken, we're trying to think of ways to argue that building this larger, better-supplied library doesn't meet residents' needs better than the existing several small libraries do.
Maybe it's convenient for residents to visit the branch libraries that are close to their neighborhoods, while a single main library would be farther away and therefore less accessible.
Maybe residents don't even care about the wide selection of current books. Maybe their needs revolve more around older books, computers, study rooms, and meeting rooms.
Goal
Let's look for any storyline that says the current state of affairs with several small branch libraries would serve residents' needs better than one large library that has a wider selection of new stuff, or just an answer saying that no one cares about the wider selection of new stuff.