I'm just unsure of the cause of the issue because when I grab the wiper and can move them 4 or 5 inches, I thought it would be the motor, but it sounds like a lot of people are seeing the exact same symptom and fixing it by replacing a bushing after reading this thread:
http://forums.nasioc.com/forums/showthread.php?t=676373
Now I'm not going to employ that ghetto solution, but I just want to avoid replacing the wrong part (motor or linkage). It sounds like Subaru won't sell the bushing so you have to buy the whole linkage mechanism.
Note to Self: Wiper and Washer Systems, here:
http://ken-gilbert.com/wrx/mans/6%20-%20BODY.PDF