I used to be an engineer and had many drafters working under me. At one point, management decided it would be more efficient if the drafting work was done on a second shift versus during the more productive first shift when my talents were needed elsewhere instead of helping drafters. It didn't last very long. The drafters needed to be in constant communication with the engineer at times to determine design intent which couldn't be relayed through any of those software packages mentioned. If they got stuck, the entire evening was wasted until I got in the next morning and then the entire day was wasted until they got in for the second shift and I got things straightened out. We went back to having the engineers and drafters work together on the same shift. I would guess this would apply to drafters that worked from home and thus may be hard to find a job as you described.
There is more opportunity in doing complete jobs from engineering the details to delivering a completed set of prints. I did that for many years and it was away to work from home though I spent a fair share of time traveling around to see clients and provide support after the prints were handed over and building commenced. You really didn't specify that you husband was an engineer, only that he stopped doing "engineering" which I find many people apply to tech degrees. If this is the case, perhaps your husband should pursue a BS degree in engineering which would make him more marketable.
On a side but related note, I too got tired of being an engineer. Many companies have gone from putting engineers into management to just being a disposable resource. Salaries have been pretty stagnate for over a decade or more. I gave up engineering and went on a long term sabbatical that has gone on five years and still continues. Occasionally I still do an odd small design job for a friend but I don't wish to do so for a career ever again.