If we get out of the arms embargo Al Shabab and clan militias will soon disappear. It's a matter of fact that even Amisom have weapons restrictions and they still can defeat Al shabab but they have no incentive in changing the status quo due to financial reasons and political reasons. The Somali army is 10,000 minimum and Al shabab was 8,000 at their climax but how are they able to besiege cities, control the country side, and collect taxes? Simple, because they disarmed the clan militias and have a monopoly of fire power in their areas. This means that it's very hard to resist against Al Shabab rule unless your an armed clan or have Amisom or SNA backing. Imagine if the government armed and trained locals with heavy weapons. This would create stronger local administrations and Al Shabab wouldn't have a void to fill.