The Lebanese experiment of sharing power between multple ethnicities through a quota system won't in general work because each office becomes the 'property' of that ethnicity, to be hoarded and aggrandized relative to the other offices under apportionment. The offices become chuqim with no covenantal relationship.
A better approach would be the one devised by ATT – the dialectical approach. Each office-holder's ethnic community gets to appoint the successor's successor. Thus, the office becomes a choq but it also requires shemitta, and so, covenantal relationship and mutual respect and aid.