By 'they', I am assuming you mean
DVC. DVC has up'd the communication to members lately about their banking deadline, both via emails and on the DVC Member Site.
Many people plan on using their current UY points to make/modify reservations after the banking window ends and before the end of the UY. It is all about point strategy. Banked points have to be used in the next UY. If you banked those points, and then wanted to make a reservation in the last 4 months of your UY, you will need to borrow from the next UY. Since you can only borrow 50%, and can't borrow banked points, you could be in a bind on your reservation. Also if you banked points, then borrowed; you may not have enough points to book in 2 years since the banked points will expire in the next UY. Yes, you risk losing the points if you don't bank, but if you have a booking plan with a Plan B (i.e., SSR), then you'll be fine.
DVC point usage requires a clear understanding of how your points work. I have a spreadsheet detailing our vacation plans (with Plan B, C and D) out for the next 4 UYs. It's very helpful especially since we are restricted to 50% borrowing. So my banking/borrowing strategy is very delicate; and the last thing I would need is for the 'system' to automatically bank my points. Perhaps the website could offer an Option button to Automatically Bank, but that would have it's own issues.