In 20-30 years you will see insane African megacities of 40-50 million people...We don't build megatalls simply we wanted to, but to solve the office shortages and demands required.
Even dictatorial regimes in Africa would not build a 600+m skyscraper in the middle of no where, the closest in being was Egypt and Morocco's plans to build supertalls, and that is only just a singled project.
Supply and demand, Africa can't even have the supply, so why the demand to build more?
My opinion is for pure-skyscrapers only. There might still be a possibility that sight-seeing observation towers / freestanding structures will dominate the future "megatall" skyline in the world.
The supply will be there