I will have to disagree and state that I think that years of guerilla war in the South would have been preferable to the actual outcome. It would have kept federal troops in the South for a generation at least and enforced structural changes upon southern society and its economy that would have probably lessened the unpleasant costs and consequences of southern racism for the next century.

A simmering rebellion in the South would have also tied Johnson's hands and enabled the legislature to fully enact its desires (or at the very least ensured Johnson's conviction by the Senate.)