If you're not operating as scale (and let's face it most of us are not) then fault tolerant external storage can be a useful part of a resilient system. To date, the down side has been that external storage is slower than internal storage but that's all part of the speed/reliability/cost trade off - pick any two.
NVMeoF greatly improves the speed (latency/bandwidth) and and will be more expensive simply because people will pay for the speed.
It will probably be normal in 5 years time and I'd be happy for NVMEoF over fabric to replace Fibre Channel.