my 2008 Mac Pro runs ML perfectly.
You should be safe, so long as apple doesn't switch architectures to ARM or heaven forbid back to PPC any time soon
That's a pretty solid machine. The only reason I won't suggest them to people buying today is unknown history + unknown future support cycle from Apple, but if I owned that model today, I would see no reason to get rid of it. The OP just seems a bit nervous given Apple's somewhat increasingly aggressive de-support path on some hardware. The weak graphics chipsets were dropped. This was before intel actually put significant effort into integrated gpus. Anything with 32 bit efi was dropped. Next I think they'll require an OpenCL capable gpu, and the 2011 has that. The 2011 was a really solid machine. I think it could see 4 years of supported OS revisions given its supported versions of OpenGL/OpenCL when using discrete graphics and the quad cpu + certified to 8GB of ram.
Those rumors finally died down. Let them stay that way.
I do feel like apples support has been very well selected based on performance. The discontinued lines are no longer able to really support the updated bulk of the new OS's.
Apples voracious appetite for drama, conflict & revenge on any percieved competitor, shows no sign of abating. I had hoped that Tim Cook would put a calming hand on things and return Apple to the once dignified, professional company they were.
However, based on yesterday's report that Apple continues to seek a ban on Samsung sales, it's apparent that no sum of money will make them happy.
Now with us confined to the Mac App Store for all future OS updates, bug fixes & the like, they're free to shorten up timelines, forcing users to buy new hardware even sooner than in the past.
It would be great to see them focus on the positive, but for now they're like sharks with blood in the water.