However with the switch to core I, Apple had to switch to Intel system chipsets from Nvidia so on top of dropping the old core architecture, they would also be moving to all Intel system chipsets instead of supporting Nvidia and Intel.
Really?
2011 Mini: Core i5/i7 CPU, AMD 6630M GPU
2009-present iMac: Core i5/i7 CPU, multiple AMD / Nvidia GPUs
2010-present Macbook Pro: Core i5/i7 CPU, multiple AMD / Nvidia GPUs
2013 Mac Pro: Xeon CPUs, AMD GPUs
pre-2013 Mac Pros: Xeon CPUs, practically any GPU that fits in a PCIe slot
It is true that the Mini has been sticking with all-Intel GPUs in recent years, but the vast majority of Apple's other OS X machines have been using (and still are using) AMD and Nvidia GPUs. I don't see Apple profiting in any way by releasing a version of OS X stripped of all non-Intel GPU drivers; they'd still have to keep the drivers for most of their other products.