dont worry, the message has reached to his followers properly. any one who tries to torment his followers, will not have peace. muslims are peace loving community, but if you make their lives measurable, you will have to lose your mental peace too....
selection of successor is totally based of mutual concensus. prophet was not a tyrant who will appoint someone who will start doing any kind of act and will not be able to be removed. islam gives the perfect system and is not a monarchy what you are expecting......
and prophet's will was well take care off. you need not worry about that.
there is only one thing clear to every one, if you want peace. please let others live with peace...it is totally mutual...
islam says, DONT OPPRESS AND DONT GET OPPRESSED. BOTH ARE EQUALLY CRIME IN ISLAM....