How likely is it for a person on probation to have it revoked for being behind on restitution?
Here is the thing: your reasoning makes sense when looking at the matter in the abstract.  But the reality is that the restitution is part of the probation requirements and if you do not make the restitution then you are violating probation.  And in violating probation then probation can indeed be revoked.  So this is what I would do.  Make some effort to making some payments and seek help from your attorney or legal aid in looking in to what you can do about ;lowering the payment s again so that you can make them  You may have to make smaller payments for a longer period of time.  What ever you can do.  Just get help.