ColdFusion is kind of a dead language at this point, but there are still many legacy products build in CF that need to be maintained. With CF developers in short supply, you could carve out a valuable niche for yourself if you want to deep end on the language.

Getting a CS degree on the cheap seems like the big pro here and would help you down the line. Even though its possible to get a developer job without a CS degree, it certainly helps. Many companies screen out anybody without a CS degree altogether.

If you have a lot of downtime you might be able to pick up some consulting work as well and broaden your exposure to some other technologies.