There is a point to that. If the government intends to restructure the economy to make it more resource-efficient, a recession (or better yet, a depression) would be the ideal time to do it for a number of reasons:
1. A restructured economy would need a new set of skills, and that means having to hire teachers to retrain the workers. In times of labour shortages, we'd have to compete with other employers for these teachers, and would also have a hard time finding students since people would all be working trying to keep up with inflation.
In a recession, laid-off workers are availabel, and thus cheaper to hire owing to less competition from the private sector. And unemployed workers willing to undergo retraining are available too, since they're unemployed anyway and would be more than happy to upgrade their skills for the future job market. In addition to this, low inflation saves the government money on having to increase social assistance benefits to keep up with inflation.
2. To restructure the economy costs money. In times of labour shortage, inflation and/or interest rates is/are high, so people aren't willing to pay more taxes needed to pay the retraining to restructure the economy, nor will they accept the government printing money to get the needed funds as that would raise inflatoin even more, and borrowing money would be at high interest too.
In times of recession when interest rates and inflation are low, people are less likely to worry about tax hikes since prices and interest rates are low already. And should the government print some money, the risk of inflation then is not as high either. I still oppose government debt, but if the government must go into debt, then at least during a recession, interest rates are low too. So a recession, or better yet a depression, is the ideal time to restructure the economy at low cost.
Of course re-education would be just a part of restructuring. Creating more energy efficient infrastructure would be part of it too, but the rulse would apply all the same as with retraining. Workers are cheaper, inflation is down, interest rates are low, so the government can get a good deal if it restructures now. In times of labour shortages, it would have to compete with the private sector for the needed workers and materials, having to outbid them, thus driving inflation and interest rates even higher.