  For more than 45 years, many multi-valued circuits have been presented. With
very rare exceptions, they have been unsuccessful for fundamental reasons that
can be explained. Each time a new circuit technology is presented, a lot of new
MVL circuits are proposed. Can new circuit technologies overcome the
fundamental disadvantages of MVL circuits? The evolution of IC technologies in
the last decades unfortunately increases the disadvantage of MVL circuits
versus binary ones. For non conventional technologies, only quantum devices
look promising, even if implementation is challenging and applications are
restricted to a small niche.
