There's too much differences between the 5N and 7 sensors for the 7 to be considered an upgrade to the 5N.
One is the best low light/High ISO, APS-C King and the other is the highest resolution, APS-C monster challenging FF.
If you mean replace the 5N with the 7 then no, I'm not one of them, the 5N is just too good not to have.
But that doesn't mean I will not be getting a 7, in fact, the consideration is between the A77, Nex7 and A65.
Points to consider:
#1) Which will be available first, the Nex7 or the A77/A65 fw version 2.0
#2) Do I want to be kinder to my back ? ...the Nex7 wins in terms of weight followed by the A65.
#3) Look good, feel good factor ? ...the A77 wins hands down
etc, etc.