For sure, if you can apply a small amount of effort for a high probability of easy re-usability, do it. But if you start going off into weird abstract design land to solve a problem you don't have yet, while it might be fun, probably you should stop. At least if it is a real production thing you are working on.
I guess it depends a bit on the shape of your abstract design land. Sometimes it can give you hints about how your API should look like, or what's missing.
