My '09 MPB is still going ... after replacing the superdrive and logic board, and upgrading to a SSD drive and the max of 8GB memory.
Apple seems to forget that their premier laptop, while a portable, is also a pretty powerful computer used by loads of people worldwide.
While it's nice to have portability as an option, in practice mine is usually plugged in, with an external monitor.
Probably the real reason they won't go beyond 16GB isn't energy as they say, rather nobody's going to shell out for their hideously overpriced, soldered-to-the-board memory.
I'm never buying another Apple product I can't work on, and upgrade myself. Unfortunately, Adobe still has no path to running on Linux, so it would have to be a VM of either M$ or Apple's own OS. Either way they're not getting any new hardware sales from me until they realize that while the walled garden might be fine for tech-clueless cell phone users, folks that know what they're doing don't like being held prisoner to their machines.