2001 - One problem with technology is that you hit limitations, mostly due to materials used or how small machines can make parts like Zirconium Dioxide (which is used to reduce leakage issues). The new THz transistors brought processing to a new level; High process tasks like facial recognition could be achieved. The TeraHertz also worked on 0.6 Volts, so it vastly reduced power needs.
Intel expected this technology to be implemented by 2005. However, as to this date, the TeraHertz transistor has not been, nor seems to be planned for implementation in processors.