Still if communication was easy and frequent, majority wouldn't be doing it. Just look at different dialects of English today like British, Indian, Australian and American. One or two are more present due to current entertainment and economical reasons. I believe the effects of these would be much smaller if we were speaking of more distanced areas with even less traffic between them. Only with instantaneous and easy travel there would be one universal language, and I personally remember just one book with such.
Trade language is most likely, and it will likely change based on most powerful force present.
Still, I don't have any idea how this goes with original topic ;D
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