As someone pointed out, even thought what we all know today as a common interface or idea does not mean it always that way. In 95 when this guy had this idea there were no similar ideas so it was new and unique. You can not write the guy off. BTW, he first showed it in 95, and submitted it back in 96, I am betting he has notes that take the idea back before 95, this is usually how it works. Most people do not run out an patent an idea as so as they have it. As long as you have documents that back up when you originally had the idea.
One last point, this is a test case and if it goes well you can bet he will go after every other company who has a similar idea.