NVME over X seems like fun. After a decade of shying away from fibre channel, we've finally got to the point where we've forgotten how awful iscsi was to look after. (and how expensive FC used to be, and how disappointing SAS switches were.)
Ethernet is absorbing all the features of other networking technology, and adding them to it's own perfection.
That being said, nvme seems nice with no major footguns, so I guess NVME over X is in principle at least a good idea.