Computerworld ponders the possibility of the next iteration of OS X being free of charge:
After all, just how much does the world’s most valuable company need the comparatively paltry $200 million it can expect to realize from c.10 million sales of its OS? Moving to a free upgrade model would enable Apple to deploy major OS improvements to a wide audience extremely quickly, and with the goal clearly being that of a device-agnostic computing experience supported by iCloud, this might be exactly the way to ensure the level of market take-up an operating system needs to achieve that goal.
With iOS, we as consumers have come to expect annual software updates that are significant and free. Why not follow the same course of action with the Mac?