There only way that there would be possible military conflict is if Republika Srpska actually tired to go through with the attempt of secession, which is very unlikely. Dodik starts with his secession Spiel every election and nothing ever happens. I think its the best way for him to make the people forgot in what kind of economic state the whole region and country is and so get re-elected. Also, Croatia and most likely Serbia would not want to get directly involved in any new conflicts as they have to much at stake economically and politically.