Well, this is a surprise. I have been a lifelong fan of Dylan, I admire his stance on many issues , I love his lyrics and I think he has been a pivotal figure in music.Having said that, if I was going to give a literature prize to a musician, I would give it to Leonard Cohen, or Joni Mitchell perhaps.
But I have no great problem with Bob Dylan getting it, especially when I remind myself of some of the mediocre writers who have been awarded the honour.So, good on Bob.
As for the accusation of plagiarism, utter nonsense !