I don't have the Fury X anymore, it's FAN broke on warranty, replaced it with a RX480 which has no fglrx support.
My secondary machine could fit a 6950, but that system is at a friends house atm and I have no access until next weekend.
Technically speaking, I see no real reasons why catalyst should still be maintained in Manjaro. Latest with mesa 17, the performance of the opensource driver kicks fglrx like there is no tomorrow, and the OpenGL support now is also identical (both 4.5)
I guess a look into this statistics could also help making a decision:
thanks to @mgundogdu for posting that one.
If there is a significant number of users who still want to use fglrx, my guess would be removing it from the install media, but keeping it in mhwd for people that really want to use that old beast.