About 2-3 years while visiting Nanyuki, and having some serious nyama, I looked around at the lay of the land, and thought that it would be quite suitable for a Capital City. Lots of 'idle' land owned by ranchers.
Nairobi could remain as commercial capital. The new city should be planned properly from scratch, hopefully with provision for urban railroads and adequate utilities (water and electricity). 2030 ought to include this?
Personally I would not mind moving out of Nairobi (just that everything now is centered and focussed on Nairobi - e.g. Internet Traffic from Nairobi accounts for about 80% of Kenyan traffic).
Lets not rush into this. A proper plan, a proper and timely execution and an absence of corruption is what is needed.