After reading through your statements and responses, what pops out is that the metric being applied in valuing a CS degree is vocational. For some people that might be the right choice. But having waded into the world of CS MOOC's already, it appears that metric might be the wrong one for you.

If you're interested in studying CS, then it's o.k. to indulge yourself when you're in a position to do so. It is not as if it will hurt your career prospects. I'll go further and suggest that at our age, we're going to make the rest of our careers ourselves, and because you seem to have a passion for learning and teaching, that may be where you wind up.

Or not. Why not a degree in mathematics and a Master's in education?