Possibly all together. In MMIC design, recently we witnessed a transition from "bare" GaAs to SiGe and now GaN, also in power devices, SiC. More materials are investigated like graphene.
Several years many people work on system-on-chip, mostly used in cell phones and medical imaging systems.
Due to the quite random action of money markets, fashion and other unpredictable effects, no forecasts can succeed really.