My first thought when I read the title was that it will be 20 years before even 80% of Java users upgrade to the version of Java that doesn't support Applets.
If I had to guess I'd say your project is either a control panel for some sort of network-attached device (e.g. a NAS or UPS) or else the configuration manager for a server blade chassis. I could paper a wall with the number of IA waivers I've had to get to keep some ancient browser/java/flash version around so I could access some config thingy to hardware we bought years ago...