Jewish synagogues were burning in the night before the big celebration and on the museum, the former concentration camp Buchenwald swastikas were painted again. Hate is a long lasting poison. You would get the same result if you asked people of former Yugoslavia. Many in those newborn little countries will be glad, many will feel sorry about the former state and quite a few will say that they hate everything and everyone. Since the division is done and there is no external war, they will go on fighting each other, be it for the so-called power, be it for the pleasure and excitement of the adventure, but most of all for hate and bitterness.
History tends to reprisals.
Maybe Yugoslavia will be united again one day and maybe one day the USA, Canada, Spain, the United Kingdom or some other country will disintegrate. There are enough reasons to support both of those trends. However, human animals can think and that makes them superior. It would be a real tragedy if someone would erase all borders and nations in the world. There would be no reason for hate and life would be so boring again.