Ruto already inherited ODM lock, stock and barrel. Okay we will leave the barrel (Luos) for Raila. You see at this stage - GEMA (Uhuru) will soon be begging Ruto to make them DP. That is how just incredibly resourced and hardworking Ruto has managed to own the country. Ruto has support from entire Rift Valley (even kikuyus there will go rogue if Uhuru tries games); part of western; northern kenya, coast and now even Gusii are warming up. He is accessible, generous and cares for people who matters - so any gema upstart who wants to start a war - ohoo boy - he'll get knocked out with first punch.
Anyway I don't think Uhuru has the stomach for a political fight - he clearly told Raila that much and ended the referendum drama - so he'll just pick his girlfriend Waiguru to deputize Ruto - and possibly his son Muhoho will join politics - to continue the kenyatta legacy of stealing.
And apart from lacking the energy for the fight - Uhuru like any other politician is very corrupt -- you know he ate the whole 10% of SGR alone

That is a lot of money - Ruto wanted to eat too with DL(David Lagat) - Wanjigi wanted it too - but when Uhuru took it whole - Ruto was smart enough to look for smaller deals - while Wanjigi threw a tantrum.
Pundito, very soon Raila/odm/luos will be the least of your problems.
1) The split between Ruto and Ouru is no longer just a rumor as you had hoped. Its real and uthamaki is coming after Ruto in full force.
2) Get used to the fact that there is no official opposition party in Kenya anymore until we fix the electoral system or come up with a new form of government that makes sense.
3)ODM/Raila will not play the role of opposition. Anybody who want to criticize the government can do so and anybody who want to support the government can also do so but it is not a job anymore.