I think it`s hard to say. The same lanugage simplify life, but the most important is history and tradition. In the past, many people fought for independent and national identity.We must respect this. In addition, when we will have the same language, everything will be boring and equal. Differences are signicficant, because they create cultur. Each country is another and this is beautiful. Everything rose long time ago and should stay (takim jakie jest) In conclusion I reckon that the same language is bad idea.