Tom Selleck is Magnum. When the series ended the show was over. There will never be a new Magnum.
Oddly I do not have a problem with a new series set in Hawaii with cops, bad guys, good guys and many that are also bad and good. That is what Magnum PI was. The old Magnum PI series was actually a morality play much like our old western movies but moved into present time but in Hawaii. It was a brilliant series.
DO NOT CALL IT MAGNUM PI. It is not!
Forgot to add this, Higgins the Englishman in reality was from Texas and in interviews sounded very Texas. He was a great actor as was Tom Sellick.