but I expect FW to take the lead on all electric flight. Don't dismiss the ETR because of battery technology
perhaps because you can cover the wings and the top of the fuselage with solar panels - you haven't got that surface area on a RW.
If you are going for a generator you will need to drive it mechanically (MRGB most likely) = more weight/more complexity and the single point of failure ceases to be in the TR drive chain (as with conventional TR) but at the drive for the generator - how is that so much better?
You could take a NOTAR and bolt the generator on in place of the fan but you still have a mechanical TR/Fenestron at the other end - again what progress/advantage?
Perhaps just improve design/maintenance so people can't leave the nut off the end of the TR servo arm..........