I think that the very first 4-wheel drive tractor was an unusual "green" painted Allis-Chalmers, articulated machine back in the early 1930's, or late 20's. It may have been that companies first tractor, before they started making the "orange", gas, 2-wheel drives, that were so popular, almost in the league of Ford, IH, and JD, from the late 30's thru the 60's. They brought back the 4 wheel drives in the late 60's or 70's, and made them until their demise in the 80's. I think that those ones were all diesels however.
I am also fond of them old gas 8N's, and for many tasks, greatly prefer them over any modern diesel. 4-wheel drive don't mean much when operating a 3-pt, 2-bottom plow (all the traction force is transferred to the rear axle anyhow), or a 2-row, 3-pt corn planter. I think almost anyone would have to admit the vast superiority of gasoline power for winter operation. For jobs where the 8N is poor, I think the "perfect tractor" would: Start with the basic "N" and its fuel-efficient, flathead-4 gas engine. Add "live" hydraulics but keep them as dependable as the original N's "dead" ones (unlike the trouble-prone early Ford attempts at "live" with the Jubilee and 600 series). Forget about "live" pto as a cheap little orc takes care of that weakness. Next, add an extra-strong front axle, power steering, and 4 wheel drive. Thru the use of modern, high-strength materials (titanium maybe?) do all of this while maintaining the original, 2wd, 8N's weight, small size, and easy mount/dismount (from either side). Also, make all the parts, that may be required, available at your neighborhood farm store like they are now.
I know NH tried making a retro-8N for a while but it never panned out. Too big, too heavy, and diesel power sunk the ship there I would guess. I continue to be amazed at how quick and easy ANY 3-pt implement can be attached to the old 8N's. With all the modern diesels 4wd's: quick-hitch, Pat's, I-match, etc., is required to get that done in reasonable time and effort. Harry Ferguson would turn over in his grave if he saw what has happened to his invention.