There are still active attacks against DOS and Win98. Automated driveby attacks, just looking to increase the size of a bot farm. There are still new exploits being released against rather old systems.
For anyone saying these aren't targets, no they are probably already hacked. These are the things that keep the national security folks up at night knowing an adversary has them already backdoored and set up for take down. Moreover if they execute on that they would go for maximum damage first to either create chaos, or prevent the system from being repaired easily.