To me, "go into ether" means disappear without a trace. However, I don't think I understand the difference between "vanish into thin air" and "go into ether". Are they interchangeable? In the following context, the writer uses "vanish into thin air". I just wonder if it could be replaced by "go into ether". Perhaps if we can find helpful teachers and cram schools that cna provide hope for our course of study, the sense of frustration with having to use supplementary education would vanish into thin air.