I have argued before and I repeat again: Kenya is over-represented. This country needs perhaps a maximum of no more than 150 constituencies, anchored in law so that we do away with the nonsense of redrawing boundaries and splitting constituencies every 10yrs. The law needs to establish the max no. of constituencies as well as the population of each. That way, the no. of constituencies per region/county/province would be dictated by population census figures as conducted every decade while the total no. of ~150 countrywide remains unchanged.
As far as counties are concerned, I'm afraid abolishing them would prove too unpopular at this time. The top guys will most likely hope that they unravel on their own. I would personally wish they didn't exist but I'd be willing to go for a compromise of about 15-18 counties max. Let no one fool you, counties as they exist now are nothing but tribal conclaves.
By the way, how is a country like China, with a billion plus citizens, administered? India?
Life is like playing a violin solo in public and learning the instrument as one goes on.