I think one of the difficulties with diamond was that n-type doping was very difficult in the past. However, there have been a huge number of improvements in fa

I think one of the difficulties with diamond was that n-type doping was very difficult in the past. However, there have been a huge number of improvements in fabricating various diamond-based devices (driven primarily by the development of various color center in diamond for applications in quantum optics, quantum computing), so it's likely to become more plausible in the future. I don't know much about the relative performance of diamond transistors versus silicon transistors, so I can't say anything concretely about that. I could maybe see some sort of diamond solution being used as an add-on to current silicon technologies whereby the diamond helps enhance heat transport/cooling of the silicon device.