> Isn't how an evolution for a new language begins?
Consider evolution in biology. A species becomes distinct from another species when their individual members can no longer interbreed to produce fertile offspring. For an ancestor species to split into new ones, its populations have to be separated — either geographically (in the so-called allopatric speciation), or by the difference in reproductive timing (allochronic speciation). The point is, something needs to happen that breaks the free mixture of organisms between populations.
It should be similar with languages — the societies that speak them get separated, and the language they speak evolves separately in different directions to become mutually incomprehensible. Which, with the current state of communication, is only likely to happen if humans become an interplanetary or an intergalactic species. On the same planet, we have plenty of opportunities to mix together and talk to each other, which, were there a hypothetical common language, should prevent it from splitting into multiple languages.
Consider a major modern language. It will contain multiple jargons/slangs/argots that are barely comprehensible to each other (e.g. the medical jargon, or the physics jargon, or Cockney rhyming slang, and so on); and yet they contain a large mutually comprehensible common core that makes television, radio, shopping, conversations between strangers, and so on possible.
That is an assumption. In this day and age of globalism, multiculturalism and fast technology advancement the measurement of geographically distance for creating a split can paradoxically be an inverse.
Two groups of people can live next to each other geographically but have hard time understanding each other and not only that both can be uninterested in changing that.
What this means is that you can live geographically at one point and share nothing with those around you but communicate to galaxies far away far away with people you do.
> Two groups of people can live next to each other geographically but have hard time understanding each other and not only that both can be uninterested in changing that.
Isn't this description also an assumption? Do you have an example of this? Groups of people who have the same language, but have hard time understanding each other? The closest I can think of is dialects, e.g. regional dialects of British English or British English as opposed to Australian English or South African English, or Australian English; but again, they are mutually comprehensible, and the more cultural exchange happens between these communities the more comprehensible they should be.
> Isn't this description also an assumption? Do you have an example of this? Groups of people who have the same language, but have hard time understanding each other?
There are two obscure tribes found in a remote part of the North American continent in which this phenomenon can be observed. I believe one calls itself ‘the Democrats’ and the other ‘the Republicans’.
You can see the beginning of new languages evolving with the the mix of multiculturalism, taking words and expressions from their old languages and adding to the new language where they live. And because the majority does not have these words and expressions, and probably never will, eventually they will diverge. Yiddish is a example of this.
Consider evolution in biology. A species becomes distinct from another species when their individual members can no longer interbreed to produce fertile offspring. For an ancestor species to split into new ones, its populations have to be separated — either geographically (in the so-called allopatric speciation), or by the difference in reproductive timing (allochronic speciation). The point is, something needs to happen that breaks the free mixture of organisms between populations.
It should be similar with languages — the societies that speak them get separated, and the language they speak evolves separately in different directions to become mutually incomprehensible. Which, with the current state of communication, is only likely to happen if humans become an interplanetary or an intergalactic species. On the same planet, we have plenty of opportunities to mix together and talk to each other, which, were there a hypothetical common language, should prevent it from splitting into multiple languages.
Consider a major modern language. It will contain multiple jargons/slangs/argots that are barely comprehensible to each other (e.g. the medical jargon, or the physics jargon, or Cockney rhyming slang, and so on); and yet they contain a large mutually comprehensible common core that makes television, radio, shopping, conversations between strangers, and so on possible.