Have you looked in to the career prospects for a Philosophy major?
Unless you're good enough to be teaching this marginal stuff as an aside to other disciplines, it might be hard to find a job that pays anywhere near the IT level.
Of course, if it's primarily for personal development, go for it!
Somebody said, when Science displaced God as the Truth, (in the 19th century!) that philosophy has been relegated to the realm of semantics. Perhaps you might get more from a linguistics course.
I assure you, I have no intention of quiting my day job in order to pursue this. I still love developing software and have no plans of walking away from it. I have simply always been passionate about the roots of Philosophy and also happen to have a fondness for the much maligned, idealistic philosophy from the early to mid 20th century known as Logical Positivism.
You should do what you feel is right for you, but for my 2cents, at this point it's a matter of what you want to do more than a matter of what career opportunities it might offer. Not sure how old you are, but you say you have had a good career in software, it's probably a little late to start another one in another discipline. You worked hard to be able to make that decision. Doing something just because you want to is your reward.
I understand what you are saying. Like I said, I have no intention of quitiing the job I love that also happens to be paying my bills, and would be paying my tuition as well. I can simply work full time and go to school on the side, taking classes on my own schedule. One thing that I am particularly excited about is what people have been telling me about Philosophy departments recently making a shift away from socially toxic agendas and regaining focus on the practical applications of Philosophy and it's usefulness in vocational pursuits.
Heck, my naive forays into Philosophy as a High School nerd reading Plato later helped inspire me down the obvious path into object-oriented programming as a young adult as it undoubtedly many others in my generation.