I want Himawari to get it but that's a dream not an expectation. I feel like the only options are Boruto and Himawari but a non-Uzumkai could get it I guess or maybe the son/daughter of Boruto or Himawari.
The Reason I say another Uzumaki will Get Kurama after Naruto is because it was passed from Hashiram's wife who was an Uzumaki then to Kushina just because she was an Uzumaki and then too Naruto because he was an Uzumaki and there was no one else around.