Its hard to say if it would get worse or not, but it does sound like a 'depression' on the LCD screen. I would suggest that you may want to 're-examine' the your storing habits. If you keep your laptop in a carrying bag, try to keep the bag from being 'too full' and having the laptop squeezed and compressed in the bag. You may want to place a thin paper towel between the screen and keyboard when you fold the notebook closed. It may keep from screen from scratching and depressing further. You also may want to consider purchasing a new/used screen from Ebay or something.

Good luck