the hertz speed of a processor has absolutely nothing to do with the "speed of an electron". hertz is a unit of frequency; i.e. how many electrons pass a point in a given time. this can be increased by speeding up the electron, if it is not already at the speed of light, or by increasing the number of electrons in a stream. for instance, gamma radiation has a higher amount of energy than x-rays. is this because the gamma radiation moves faster? no. it is because the gamma radiation's frequency is much much shorter; the gamma radiation contains much more energy.
gamma rays, for example, range in the exahertz range. one exahertz is 1000 terahertz, where one terahertz is 1000 gigahertz. theoretically, the only possible limitation on how high frequency could in reality go would be defined by the planck length, a concept that's really not worth getting into here. and in theory, the frequency could be infinite.
to sum it all up, it's possible that in 10 years we will have made massive advances in heat reduction and we will be running 10 THz (terahertz, 1000 gigahertz) processors. however, this is pretty friggin' unlikely, as well as pointless.
</physics rant>
edit: oh yeah, i'm a highschool junior