The post is months old but I feel the need to speak against this sort of negativity. Some people who have set up private hiring have done it because they either speak enough English to communicate with their English teachers or have the personnel who can. If they don't, how much is it really going to take to get a competent friend or acquaintance to translate for you? How much money would it cost you to pay them? Remember, those people are looking for English teachers, not Japanese speakers. In fact, they are not even looking for people knowledgeable about Japanese business practice and culture. In fact, many Japanese employers of English teachers are quite happy to have the capability of immersion for their students that only a complete newbie to Japan can offer.
And nobody is looking for a Mr.Negative Cantdo either. They much prefer people who can find solutions and put them into practice. And that is generally evidenced by your ability to information from your friends, get someone to help you if need be, and get your interview lined up and rolling despite language barriers.
When Interac lost their contracts in a city in my area, some of the teachers went to the new local contractors and got their old jobs back.
There is life after Interac. And Interac can be beat.