Interesting thanks for sharing that link. Slightly unrelated but what are some potential opportunities for business in Kenya for those living abroad but want to return?
I think there are a range of software businesses that are now viable given the maturity of the mobile money systems, the penetration of smartphones and coverage of data networks. B2C is tough as purchasing power is low, but if you get to significant enough scale it works out. I'm seeing physical products do better for now in B2C, e.g there are a lot of so called pay as you go solar product players with decent investment now. I think B2B is still pretty untapped though and is personally what I'd explore more. Lots of businesses require tech solutions that solve challenges specific to a doing business context in East Africa. There are a lot of startups in Nairobi now, but quality is wildly variable. There are lots of gaps to fill!
There is quite a lively tech scene. One example of an interesting all-African startup is Africa's Talking (http://africastalking.com).
If you're looking for a problem to solve, one thing I struggled with when living there is that there is a major lack of trust between renters and landlords when it comes to housing. Some landlords are ok, but many arbitrarily withhold money from the initial deposit when renters move out and I feel like that generates quite some inefficiency in the housing market. I'm not sure what the solution would be but I know many people would benefit if there was one :)