The principal problem with abandoning Apple at this point being that you can't get developer grade desktop hardware anywhere outside Apple at a reasonable price.
And if Apple ever goes back to making new laptops, those will probably be head and shoulders better than the competition at the same price, too. We don't know for certain, of course, since it's been two years since Apple has made new MacBook Pros with more than cosmetic adjustments and they may never make new ones ever again. None have been announced, anyway. The price of the two year old version, of course, is the same as it was on original release.
But there's no matching quality and features of the retina iMac for creative work, including software development, even at double or triple the price.
