I could see people being upset if they were making an EXACT remake, but it's the idea that they are using not an exact copy. The movie would have been horrible if they would have tried to get a look-a-like Myagi and named him Myagi in the movie and a look-a-like Ralph and named him Ralph.(sorry for the possible mispellings and names) They took the idea and re-did it to this day and age. They could have easily called it something else but then they would catch heat for copying the movies idea.
This was not like a Charlies Angel, A-team, Starsky & Hutch type of deal.
This was new characters, new settings, new costumes, new music, same idea.