Really, if you're treating it as well as most mamas here seem to treat their wool, it will probably hold up fine. Wool can take a lot of use, as long as it's taken care of properly. If your wool were going to pill it would already be doing so; your worries are felting it (again, proper care eliminates that); snagging it, if knit (not much to be done about this one, though if you had something prone to snag, again, you'd probably already be aware of that); or it just plain wearing thin (this is one of the wonderful things about wool — it takes ages for this to happen, and I suspect the lanolin will hold it up further).