I've never changed an oil pump on any car or motorcycle I've owned, and some have done long service. They work under constant copious lubrication so there is very little wear. The only time you might look at one is if you've had a bearing fail or some other incident that has got swarf or dirt into the oil - even then a good clean is usually enough, after inspection.
I won't say that you should not change it, and I don't think it is a difficult job. What *is* a good idea is to inspect the strainer that sits on the bottom of the pump and clean any debris off of it. They sometimes get clogged - usually with bits of sealer from the sump joint. If too much is applied, when the bolts are tightened down the excess gets squeezed out and forms a bead or droplets on the inner face of the joint. These cook, break off, and clog the sump strainer.