I've never read of a motor going but the linkages are a common one as you are aware. Oh and as it happens, I've got a few month old linkage (new from VW) attached to my used motor for same! Drop me a pm if you're interested.
Yep is usually the linkage goes first then the motor, if its going slow already i would say the linkage needs doing now.
Yea, mine were like that when it went.... One day you'll try to use them and they'll come on then totally seize.... Get a new linkage ASAP.....