Good point. I didn't think about that.There is a bushing in the leverthat can wear out. Either way, it is a good item to replace. It is part #22885-MB0-006 and is #2 in the diagram. It is a little pricey and will cost close to $10...One other possibility-- is the handle wobbly? Since the clutch lever is used way more than the brake lever you can wear the pivot hole and this will result in less 'plunge' on the plunger when depressed.
Bleeding/flushing is always a good idea, way easy and way cheap.