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Dissolving theses states might create new nations but as you say, it would be through conflict. It would be very, very bloody. It would be like the Sengoku Jidai crossed with the Rwandan genocide.
There are just far too many ethnic groups that live right next to each other but hate each other and these ethnic groups are all really too small to from a state on their own, if each ethnic group had a state there would be thousands of these nation in Africa, all being tiny micro-nations.
People give the Colonial borders a lot of stick but I don't think there was really much of a better way and neither did the African nations themselves when they were offered the chance to redraw borders.