There is still a powerful unspoken assumption in Africa that you don't mess with state boundaries. Because once you open up that particular Pandora's Box, there's no knowing where it will end. So even though the legacy colonial boundaries are in many cases highly unsuitable, the inclination is to stick with them. For that reason most African wars are civil wars.
The opportunist hijacking of the Tuareg rebellion by Answar Dine under a flag of Sharia Law has cost the Tuareg their biggest chance in a generation to carve out their own territory.
I haven't read Keenan's book so I don't know what his evidence is. Although I'm sure there are plenty of dark dealings going on, right now I can't see the advantage for Algeria in assisting/provoking an invasion of Mali by either the Tuaregs or Ansar Dine. The last thing they will want is an attack on their own energy installations. Their current economic success totally depends on the energy sector. Right now, if I were an energy company thinking of prospecting in Algeria, I might choose to wait a little longer to make my mind up.