i have a similar ride, Trek 1.2 i bought new in 2007 or 8. i have replaced tires, brake pads, chains, RD, RD hanger, and most recently the bottom bracket. i've added clip on aero bars and that is it. i now put on about 6K mi/year. i am looking to get a new ride.
EDIT: i guess my point is that if it is functional just ride it.