Im pretty sure bringing up IQ in discussion about writing systems is more extreme. If you want to go down the slippery slope of IQ, Somalis don't come out anywhere except at the bottom. I still don't see a connection between an indigenous alphabet and IQ. I can learn a new alphabet in a day, a few hours if I really try. I don't pretend to be some kind of genius, so if I can do it, so can the average Joe.
Now since, Somalia has no industry or economy to speak of, I don't see how adopting an indigenous script would be so catastrophic or inefficient.