When you consider the pace at which Intel releases new CPUs these days, I'm wondering more and more whether Apple will migrate away from Intel and move to in-house A-series CPUs some day in the future.
Apple's custom silicon isn't at a point where it can power a Mac, but based on the pace at which Apple is developing its own CPUs, you have to wonder how far off that day really is.
Apple's closed ecosystem has become so large that its taking on the characteristics of a traditionally open one:
http://halifaxbloggers.ca/straighttech/2014/06/a-rainforest-posing-as-a-walled-garden/