If I may get the gist of your argument is  'different levels of service for different internet users' (Vodafone Group CEO). 

So we are moving from just selling the content to combination of both content and level of service. That would be very innovative from a money making perspective and if I was MJ with pressure from shareholders to justify capital outlay on capacity leased or bought on Sea cables would readily go for it. 

Having said that from a end user perspective I really feel slighted when first you get me used to 3G speeds and then at some point later you tell me that from now own for you to enjoy the same content you will be enjoying at a much lower class of service unless you pay for it. Am sure with other options( better or best) being availed in the market am sure the competition will make a kill out of this. 

IMHO

Kenyan data market has not reached saturation point in terms of critical mass to warrant differentiated class of service. I think safaricom can make more money by growing more data subscribers than making more money from the existing ones. Am sure the competition is watching with glee.

conclusion

It is good Safaricom have built the capacity to be able to do this, but you are way too ahead of the Kenyan market to introduce it now.

regards

Patrick