There doesnt seem to be anything in the retail game that I know of that actually counters Nanovision.
Rather than outright reducing the strength of this utility I would rather see a Stealth module changed to help counter this. Perhaps Stealth Enhance offer a reduced heat signature at rank 3 instead of a reduced energy drain?
Obviously Cloak needs some sort of counter within the game but there are already so many.. Nanovision, Cloak Tracker, Proximity Alarm to a less extent and possibly Visor Enhance.
What are other peoples opinions on the way Nanovision changes gameplay?