I would have guffawed at the hint of a 4K screen being cost prohibitive in the past, but the Retina Macbook is proof that Apple still has aspirations of setting

I would have guffawed at the hint of a 4K screen being cost prohibitive in the past, but the Retina Macbook is proof that Apple still has aspirations of setting the tone when it comes to displays. You might be right to make your decision after the official launch of the Mac Pro. You could be on to something.