There are too many variables involved to say for sure it will/won't degrade. I live in SW Florida and its hot here year round, and typically 100% humidity daily. My display room stays at 72-74 degrees year round, and has no direct sunlight (boarded off and insulated the main window to the room to make another display wall). I have had figures with KNOWN degradation issues (ED-209 for one) in my collection for some time, and have personally had NO problems with the rubber. I have Keaton Batman, and a Batsuit begins Batman, the Hulk and a TDW light armor Thor as well, and none have shown signs of degradation. I display them in enclosed glass cabinets under LED lighting. Point is, you will run the risk, but your only option is to avoid anything with rubber if you are worried it COULD happen.