Matthew Parish, a formerly Chief Legal Adviser to the International Supervisor of Brcko who has written a book about his experience, wrote an article for Balkan Insight under the title Republika Srpska: After Independence.
It is a detailed analysis of the options that the international community had and has to influence the situation in Bosnia. His conclusion is that the international community can do very little to prevent a slow Montenegro-style independence for the Republika Srpska. He arrives also at the conclusion that the best thing that the international community can do to keep Bosnia together is to keep pushing for it. I have advocated something similar in a previous post.