Will AF retire their 777Ws early? I very much doubt that AF will become Airbus only within the next 10 years. As the 77W replacement is still a very open book you simply cannot make any definitive statements about it at this moment.
I doubt AF would become a fully Airbus airline, ultimately they could have say a subfleet of 777-9 to replace the 4 class 777 and A380. This would serve as a path for promotion also, something the unions insist on having. The rest of the fleet could be focused around the A350/A330 family. I guess the 787 also has a place here but this could simplify the fleet to 2 cockpits just like at KLM.
Its gonna take some time though, if I recall correctly, AF continued taking new 77Ws until 2015