Yes, we should all be speaking a common language on the airwaves, so... why not have French as the unique aviation language? Just a thought.
To get the record straight, the Streamline/Air Liberte runway collision in CDG a few years ago happened because ATC cleared an Air Liberte MD-83 to take off after they had cleared the Streamline Shed to cross the runway. Language was only a contributory factor, the main reason for the collision was a wrong clearance. There is no proof whatsoever that it would not have happened in the same circumstances had the two aircraft (and ATC) been speaking the same language. After all, aviation's worst ever collision - the 1977 Tenerife North accident between a Pan Am and a KLM 747 (577 fatalities) happened even though everyone spoke English.
As an anecdote, I was recently ferrying an aircraft across the Channel, and while I contacted Paris Information in French, the female ATCO kept answering in English because... my registration started with G!
Cheers