Today a player brought their complaint regarding this requirement to the official WoW forums and was able to garner a blue response. Drysc posted in the thread, mentioning that the gem has already been changed in an upcoming patch. Specifically, the "exactly two blue gems" requirement will be changed to "at least two blue gems". Additionally, he stated that other meta gems with similar requirements are being reviewed as well (although I know of only one other that might fit that category).
What do you think? Is there any doubt now that this will be the best meta gem for most DPS caster builds?