Plus the way that "The DAO" operates is going to be crazy. Basically people submit proposals of things they want the DAO to build, then "The DAO" "hires" contractors to build it (A roundabout way of investment). So Slock.it would be a contractor of "The DAO", but could theoretically be replaced.
But Slock.it is a DAO itself. So basically the chain would look at minimum something like this.
"The DAO" <-> "Proposal" <-> "Contractor Agreement" <-> Slock.it
Bear in mind that "The DAO" and Slock.it are managed by distributed consensus. And what if a company was a contractor to >1 DAO?
Add in all of smart contracts contained in each DAO, the amount of interconnected unmodifiable software that will run these organizations will become staggering. Attempting to design something to be fault free in a normal network is insane, but then you add possibilities for social faults in voting and consensus.
I am sure something like Ethereum will be the future. But the current state is extremely alpha to be handling that sort of financial power.
EDIT:
To prevent a takeover many ethereum contracts will implement an exit strategy, like splitting the minority into a new contract.