The constellations they can launch now are only a small fraction of the size they aspire to launch. Their plans for Starlink alone call for almost 10x as many satellites as they currently have. Then there are all the other constellations they might launch in addition to Starlink, including defense contracts that might call for rapid replenishment of expended/destroyed satellites.

As for Mars, Starship might be ready for that in a few years (a year ago I was saying in a year or two, but I've kicked that back). But where are the Mars customers? Who is developing Mars habitation plans and hardware that will be ready in even twenty years? Commercial demand for large satellite constellations obviously exists. Demand for Mars colonization is nonexistent, it exists only in the hopes and dreams of sci-fi junkies.

I really hope I'm wrong, because I'm a sci-fi junkie!