Assuming the 7,1 Mac Pro ends up being a suitable replacement for the cMP?
Suitable, maybe.. Costly, definitely - I remember paying over USD 10K, the price of a used car, for the 3,1 with 2 monitors back in 2008 when it was released. If you ask me whether I would do it again, the answer is never!
The MP 3.1 was very reasonably and competitively priced .
I don't know if you picked expensive monitors or BTO options, but the MP 3.1 models were not expensive by any standard .
Stated in my OP:Of course it will fade away. It's all about when it will fade away. Regardless, and not taken in to account any of it. cMpro will fade away, anytime soon.