Kodak, not Canon made the first APS-H sensors in the early 90's. It certainly could have had to do with the production capability of the equipment. It was the standard until Canon came up with a FF sensor.
I liked the APS-H format, and would consider a new APS-H body. I don't expect to see one, but, if the 1DX falls flat, they might bring it to life again, or, a prosumer body with the larger sensor is also a possibility, Maybe a 7DH?
The one weakness of the APS-H for all around use is the lack of wide lenses. You really need 12mm to get ultra wide, but the 16-35mm is fine for most uses. The 14mm prime is priced out of my reach.