I would guess that more of the HD's are 'working' trucks than 1500's.
Otoh, they build more 1500's than HD's.
For IC engines in gm fullsize pickups there are currently 8 engines available. (and more in the canyon/colorado)
LV3, LB3, L82, L84, L87, LM2, LT8, L5P.
I understand some are gone after this year, and clearly they are not all suitable for heavy towing.
But there is a good possibility that there is room in the market for electric people mover/commuter trucks.
Everybody laughed at the idea of battery hand tools too.
They didn't replace all (and may never replace 'all') pneumatic / plug-in electric / gasoline tools, but they've replaced a lot.
Gonna be an interesting few years.
I parted with the L5P, but I'm not planning to part with my little diesel.
But I'd never say never.
Technology just keeps moving ahead.
Lots of things that I recall being considered 'impossible' or 'not practical' are now considered commonplace.