I'm not sure how compelling exclusion is as a response to crime.

For one, prison sentences vary widely as all crimes aren't equal, such as from a year for petty theft to life imprisonment for murder. Though I suppose the period of exclusion could be varied similarly.

Secondly, usually people criticizing prison systems tend to vie for a form of rehabilitation that leads to reforming the person so that they can eventually re-integrate into society. Abandoning prison systems yet retaining punitive models that lead to the same consequence of barring them from society in the long run seems to be pointless.