For the time being, Silicon is not going anywhere. By that I mean, Si the element being involved in the semiconductor process. For channel materials, Intel has

For the time being, Silicon is not going anywhere. By that I mean, Si the element being involved in the semiconductor process. For channel materials, Intel has been using SiGe as the channel of their pmos transistors for two generations now, so in a sense elemental Si has already disappeared from the channel. The wafers are still made of Si, half the oxide stack is still Si-O-Ni. The rest is Hf-O. Polysilicon is still used a resistor material. The semiconductor industry has changed a whole lot in the past, there is no "Silicon is dead moment", rather gradual shifts toward different materials used for different purposes. Satellite radio transistors (HEMTs) already use InP and GaAs and have been for decades. If you want an actual prediction: Gallium Nitride and Silicon Carbide are going to be the two actively worked on materials in the near future. Both have a higher bandgap than Si, which means less leakage current and lower static power but they both come with their own problems. There is a lot of research going in semiconductor industry, people are well aware of the problems and there tons of possible avenues of improvements on current technology (such as better lithography).