True, ethnicity will surely play less factor in the future. SL is relatively new, Djibouti is a better case in point. While most Somalis there still identity with Somalis of neighboring countries, there are some who feel closer to an Afar or Arab Djiboutian as they share land and thus interact with them more than they do with let's say southern Somalis, and more or less formed/forming a new common identity.
However over the centuries we've seen different form of states all over Somaliweyne, but the clan aspect has mostly remained the same. I do believe that we'll see the same here, where Somali (as ethnic group) will lose relevance and replace with a nationality and clan identity remaining. For now, a Somalilander is more prone to identify with their clansmen in Ethiopia than another clan in SL.
I concur that being Muslims should be superior to all form of identities.
Speaking of our (former) traditional way of life, it surely is being 'torn apart' as we are moving on with time and adapting to the modern statehood of the world and our environment. But I'm more of the opinion that we should let nature take its course and follow along and not intentionally create anything new and then 'implement/impose' a new identity for the sake of having/sharing a new culture or whatever it may be. It will meet a great resistance and decrease the likelihood of achieving the intended aim.