Well, Kabyle looks like the language of a minority in Algeria. On the other hand, Icelandic is the national (and official) language of a sovereign state. In other words, Icelandic has more cultural and financial backing, which is why it's more widespread.
By the way, I'd really love to visit Iceland some day. My cousin went there a few years back and he said it was amazing!
I hate to continue the OT but this is important. Funny to see that people feel that way about Iceland. I lived and worked in France for 6 months and I feel exactly as you describe. As an American my opinion is that life is too short to not life in France (or some place like it). Unfortunately it's unlikely I'll ever be back for any decent period of time but I do know what suits me.
Certain people like different things and cultures but now I'm convinced I must see Iceland.
Iceland is great in a different way: It's the allure of the raw force of nature. You go to Iceland and see the weather shaping things around you, and the volcanoes erupting (if you're lucky) and the northern lights shimmering in the sky. You scuba dive in a fissure where the two continental plates split apart and filled the crack with millenia-old glacier water. You see a guy with a waterfall for a yard fountain[1].
By the way, I'd really love to visit Iceland some day. My cousin went there a few years back and he said it was amazing!