They'll figure out a way to make it an up charge. Need to borrow more than 50% of your points, you need to pay a fee to do so - maybe they charge per point to do so. Need to borrow an extra 50 points, it will cost you $2 per point or $100. The first 50% are free, the second 50% is an up-charge. Same for banking points...
But as an exclusive, if you purchase a 50 point add-on contract at Aulani, you will receive Borrow+ for free for a limited number of years.
Think about how the press release would read ... "We've heard your feedback, we have re-imagined how the
DVC banking and borrowing system works! We will now charge a fee per point to bank or borrow more than 50% of your points. This will help to alleviate pressure on the overall DVC system and make everyone's booking experience more enjoyable. We look forward to you using the new DVC Point+ system!".
Maybe they will introduce an app at the same time that tells you to book your resort stay at a time with the least demand too. Want to book in December? We recommend you book in September instead!