So you've pushed the blame onto the tour companies now.
Super stuff. Do you teach the premise of self responsibility to your students mate?
The hotels know when the term times are, they charge more to whichever vendor sells that room, so the hotels are profitable which is a tad more difficult to do during non peak times.
At the end of the day mate with this ruling more and more parents will actively take children out of school, which I don't agree with unless in exceptional circumstances. I understand how it all works mate but how can you get round it. Probably not is the answer.