I understand the disappointment people have, I too have enjoyed the EU, but there's always something that has bugged me about EU, and that's a lack of continuity... I think the classification of EU as "legends" was brilliant, It allows the stories to still have a place in the SW universe, instead of completely throwing them out... and this allows for better continuity in the SW universe... best of both worlds imo
Now that being said, if they keep a concept/idea/place/person in the story, they should probably keep the names and such...
But as mentioned we have many examples of renaming cities in our history... heck, we have some countries that have gone through more than 2 names in the last century... So if Korriban is the planet name in legend, and Morriband is the name in the movies, is it that hard to think that after 1000 years the name of a planet may have changed?
While I think Korriban is a better name, I don't have an issue with the name Moriband, and is easily explainable.