You have a nice bike there. Bikes are pretty simple machines. Unless you ride huge amount of miles nothing will really wear out but tires, and maybe the chain. The cranks on that bike are steel. The chainring will probably go 20,000 miles before they wear out. I run MAFAC brakes on sev er al bikes and most have original brake pads. They last a long time.

So that said the biggest sore spot on your bike is well the saddle, but besides that, the shift levers. If you use the bike a lot the levers will break. They are plastic and tend to snap off in time. A good set of shift levers would be a good thing to look into.

In time you may want to replace the wheels with an alloy rimmed set. They roll a bit easier. But the rims you have, although steel, are really pretty good. I have them on several bikes and actually like the way they take bumps. On longer rides you start to notice the weight though.

But I wouldn't worry about replacement parts. Ebay is there for anything you may need. Parts will break from mishaps like falls, sticks getting caught up in spokes, running over a critter, but from regular riding not much to fail.

And valuewise, as it sits, it's held it's original value well. $150-175.