Gail Armstrong over on Open Brackets has a nice entry commenting on the alleged decline of French as a world language and language policy in general.
While it went on to be a relatively reasoned piece, if read hastily, in the title — Last 'adieu' to French as world language? — and throughout there are inferences that French is on the verge of extinction, threatened with cannibalisation and fatal bastardization by English. (Qualifying the English language with words like "prestigious" instead of the more apt "practical" is just baiting.)
France's many regional languages were killed by an appalling national policy that forbade their teaching in schools, and this is one of the (most tragic) ways that languages die. They don't die merely from the influence of another language. On the contrary: a language's ability to adapt and transform itself ensures its continued vitality.