WTF are you talking about?
Neither a MacPro nor an iMac have ever been ahead of their time. Unless you count Apple getting marginal first dibs at new gen Intel CPU's. But then they go and mess it up with crappy GPU's that are behind the times and grossly over-priced.
My best guess at another iteration of a MacPro (if one ever materialises) is that it will be completely outshone computationally by $1200.00 PC's.
There's no Steve Jobs to weave magic silken webs now, Apple...