And you'll still occasionally screw up, because that's the nature of the job. Doctors screw up, engineers screw up, accountants screw up - everybody screws up eventually. Intelligence work, because it inherently involves limited information, time pressure, and secrecy, is more prone to screwing up than most professions.
For various reasons, mostly relating to the US being global hegemon, CIA screwups are more visible than those of the SIS, DGSE, MVD and MSS. Reorganising might reduce the frequency of screwups, or they might become more common. They might become more or less obvious. Abolishing the CIA on those grounds is only going to make sense if there's a monumentally disastrous intelligence failure that can only be resolved by firing everybody senior enough to have an office with a door. And even then you'll need a new intelligence service.