Good questions
1) Kikuyu numbers are dwindling fast and in a few years they will be second or third. It's a lie that census was rigged or that parliamentary disadvantages them. They have a bunch of protected constituencies. There is a whole thread on this... Kalenjin are the biggest loser with their headcount accelerating.
2) Greedy Uhuru wants to extend Kenyatta dynasty. Moses Kuria needs to shift base from Gatundu South - square with Ichung'wa in Kabete.
Tantrums and insults will not save him.
3) Gema are hardly united in this - Embu and Meru don't want more Kikuyu dominance. Ruto-Kiunjuri is a non-starter for them. That makes them lukewarm as you see Kiraitu is least bothered. It's better Uhuru 2.0 which neutralize Kiunjuri and give them future chance. So majority Kikuyu and Kalenjin will oppose but lose to other tribes. Even Duale if he opposes will lose the argument. Why would anyone but Kikuyu and Kalenjin oppose parliamentary which ends
60 years of tyranny?
The call for Uhuru 2.0 is diluting Gema resistance. Cause the Ruto vs Raila narrative is fizzling. Already lots of them are joining the BBI bandwagon. Governors and senators are with Uhuru or neutral apart from few Kindiki and Kihika. For non-Gema & -Kalenjin there is no distinction btwn Uhuru-Ruto vs Ruto-Kiunjuri - same old tribal duopoly.
Why would a winning coalition like Kikuyu-kalenjin support it. Why would GEMA support a parliamentary system that disadvantage them. Why would Uhuru support something he won't get? Anyway let wait and see tomorrow - how the cookie crumble.
Kikuyu and Kalenjin tribalism. Parliamentary ends one-man-one-vote. MPs are not directly proportional to population. It's akin to the US electoral college where Clinton get 48% vs Trump 46% - yet Trump become president. By winning more states. States are MPs in parliamentary.