whereas Adobe is moving to a monthly subscription business plan.
Just as a "By the way", Adobe CS6 and Lightroom are available on a subscription basis as you said but Adobe stated a while ago that Lightroom would also continue to be available as a one time purchase item.
Lightroom 6 is supposedly imminent so we may see if Adobe will stick to that statement/promise. I am a bit cynical as to how long they will continue to make LR available on that basis.