I read somewhere that by the next millienium the main US language will be Hispanic.
We had our own thought/language police in Oz, we were told to drop sex {!} no more chairman or chair woman, chair person did the job. Blind became sight challenged, short or tall became height challenged. The changes only lasted as long as the galahs that tried to push them on us.
The we reverted back to sex [hurrah!] and fact.
Language has evolved and will go on doing just that but there is no doubt a common language makes everything easier. English has always changed and absorbed much of other languages. Maybe that's what makes it universal.

@Horus, your post is ambiguous. Signage in Australia for the deaf is in the language of Auslan. This is a different language to sign language in the US for their deaf people. It was not a language developed by these "left wing" bogey-men. Is this what you are talking about? Do you know what you are talking about?

If you are talking about road signs being dictated by "the left" in the RTA, the various councils, petitions, or whatever residents decide, then that doesn't make sense either. Do you mean to say that Tollway exists read "turn the other left" rather than "turn right" because the left-wing don't like the word "right"? That is absurd. Signage is minimal for practical reasons and has little room for political biass.

Should we say "Gentlemen" and "ladies" in toilets again? Is that what you are on about rather than "men" and "women"? How Victorian of you. Or are we being too left wing in the Airport when we say "Welcome to Sydney" when a real business person would like to say "take out your wallet and spend all your money, or go home! Especially if you are brown of middle eastern appearance".

Or are you talking about Aboriginal words being used to describe places like "Ulluru" rather than "Ayers Rock"? They actually use both signs.

Compared to other countries, Australian signs are very Anglo, more so than even England and there is a lack of signs in the languages of our tourists. Tourism is a very important industry for the Australian economy. This means being friendly as well as just taking their money, and grunting at them when they don't know English. They notice rudeness and send back negative messages to their countries of origin when people treat them like this. They then go to Canada instead, as Australia is seen as too rude.

We have an economy to protect. Adapt to the real world and we will all benefit.