Lawyers are not allowed to drop their clients right before a court proceeding because they haven't been paid. The court would have to allow the lawyer to get out of the case.
And, even if the court DID let the lawyer out of the case, there is usually a limited amount of help that a lawyer can provide in a DUI case.
He will manage--the outcome will more than likely be the same with or without the lawyer. It's his mess, let him deal with it.