One problem is that intelligence will be more free for some than for others. We don't all have vast reserves of oil or nuclear power stations with which to power the intelligence.

Also, there is/will be the problem of evil people with lots of money combining it with robotics to form enormous armies where all soldiers are interconnected to each other as well as a super brain.
That will lead other states to do the same in order to be able to defend themselves, which then leads to states with the power to deploy vast robotic armies on their own people if they step out of the matrix