I still have a soft spot for 1xAA lights (especially if they also accept 14500 Li-Ion cells). I’d love to see more development of the perfect BLF 1xAA special with a fancy open source driver and a good clip, very low parasitic drain and/or mechanical lockout, and compact size.
I also think there’s room for a BLF special edition headlamp. Zebralight is awesome, but they’ve ruled the market for far too long!