Unlikely. Custom built Application Specific Integrated Circuits (ASICs) (i.e. bitcoin mining chips - e.g http://www.butterflylabs.com/) will always be faster than FPGAs (which are comparatively slow) and CPUs (which are fast, but general).
Except that every other months or so sees the introduction of a new proof-of-work system that won't have ASICs for years, if ever.
FPGAs can easily outperform the CPU/GPU competition on any alt-coin using such proof-of-work.