So, all that HARM opperators need to do is pick a country that is very flat and has perfect weather all the time, and those SAMs are as good as busted. ;)
Pantsir can hide, can run and can defend it self. None of those options are 100% safe, but it isn't helpless either. Tehcnology is being developed to further reduce its chances, but SAM designers aren't sitting still either. After all, it's not a very fresh system.