WI: Balts merge with the Vistula Veneti

What if the Proto-Balto Slavic group Vistula Veneti merged with the Proto-Balts rather than the Proto-Slavs, which means that the Slavs will remain confined in Ukraine.

What will happen to the Slavs? What will happen to the Balts? what will happen to the Germanic tribes? will they still migrate west?
 
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