As someone who has spent some time and effort attempting to develop this exact process, it's limited by poor fiber adhesion to the metal matrix.
Unfortunate but not entirely surprising. Though perhaps the fiber pull out strength could be increased by modifying the compositions of the metals/fibers to increase the binding strength. Or perhaps fiber geometry. Interesting process though nevertheless.
More interesting than copper as used in the example would be nickel or rhodium.
Can you explain more about this? Do these have certain properties that you find beautiful, or useful?
Probably corrosion resistance, if I had to guess.
Strength to weight ratio and high temperature properties.