I know both songs and frankly, I don’t see very much similarity. This is in no way a slam-dunk, as was the “He’s So Fine/My Sweet Lord” plagiarism.
Is there ANY melody which has nothing in common with SOME music from the past? What's next, copyrighting chord progressions, so that any song with a 1-4-5 in the chorus is now Off Limits?
Copyright law should mirror patent law, IMO. I don't believe three generations of descendants are entitled to a residual income from one's work.