Yes I have seen Mwea grow in few years - every time I visit my inlaws - I pass there and I see how it's transforming. The rice milling did wonders. It's good that Mwea rice is very highly regarded in the market - as the plastic rice from shoddy dealers have messed the imports.
Embu has also transformed from coffee and bananas - into Muguka and macadamia - which is highly lucrative - The problem - it a drug that affect the young people in those villages adversely. This is probably the same problem in Meru - Nyambene and such areas - Miraa despite high income eventually damage the society.
For some period when tea was doing well - our rural place in Konoin was also doing well - but now tea is dead and the economy is also dead - our people need to diversify into avacados, dairy, horticulture and etc.
Githunguri is like Kagio and Mwea in kirinyaga, thriving rural towns driven by production of goods. Small towns like Kangema and mukurwueini are growing due to increased production of milk, we now just need more agribusiness in those rural areas. This is the natural way to urbanize and develop.