Linguistic Consequences of a divided Japan

What if Japan remained divided at the end of the Sengoku and to this day what would be the linguistic consequences?
this is what I know..
1. Central Japanese dialects(dialects spoken from Kansai to Kanto area) won't be able to impose themselves to the other Japonic Languages meaning that the Central Japanese would not impose the F to H change to other Japonic languages, and additional changes might spread in Central Japanese dialects completely like /hj/(which shifted from pj to fj originally) completely shifting to sh which means words like hyuga would be pronounced as Shuga.
 
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While I can't really comment on particular sound changes or anything, if the division happens as a result of the Sengoku period, I'm thinking the range of what we can have in terms of mutual intelligibility is probably something like English/Scots, or Dutch/Frisian, to maybe English/Frisian, or French/Catalan simply considering the time of split.

As for writing, could Bungo persist to present day in some Kansai-dialect-speaking nation?

Also, depending on how much Japan is balkanized, could the Ainu go unconquered, allowing their language to have more than 10 speakers in 2013?

Finally, some other vaguely linguistic thoughts, a divided Japan would potentially be weaker to hold colonists at bay, meaning that Chinese or European languages could take root, or at least influence the development of the Japonic languages. Could we see some sort of French/Ryukyuan mixed language? :p
 
While I can't really comment on particular sound changes or anything, if the division happens as a result of the Sengoku period, I'm thinking the range of what we can have in terms of mutual intelligibility is probably something like English/Scots, or Dutch/Frisian, to maybe English/Frisian, or French/Catalan simply considering the time of split.

As for writing, could Bungo persist to present day in some Kansai-dialect-speaking nation?

Also, depending on how much Japan is balkanized, could the Ainu go unconquered, allowing their language to have more than 10 speakers in 2013?

Finally, some other vaguely linguistic thoughts, a divided Japan would potentially be weaker to hold colonists at bay, meaning that Chinese or European languages could take root, or at least influence the development of the Japonic languages. Could we see some sort of French/Ryukyuan mixed language? :p

Central Japanese spoken in Kansai and Kanto and between it would remain as a single language but is less standardized causing more sound shift like hy to sh, there is no doubt about that, Bungo will still exist as it is..

The question is how would the japonic dialects evolve now that the prestige of Central Japanese is now weak.
 
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