Mostly, it's replacing my '99 Subaru Forester...however, we still have both that and our 2001 Toyota Sienna van.
We had thought we'd hang on to the Subaru for another few years, as the beater car to take to the beach, and eventually as a first car for our older son. Not so sure now. Anyway, it's still there in the driveway.
The Mrs. and I confer on who's doing what driving-wise any given day, and decide who takes the Leaf. Mostly, it's me (heh heh).