I don't believe so, one it's getting hard to find the old MB series in any kind of shape, even the CJ series is getting scarce in the rust country.
And #2 even when I was young and CJ's were new I would not have called them easy to get into, with that tiny foot well opening.
#3 it would take quite the flotation tire to get the flotation to weight, which then is going to be sticking way out past the body and throwing mud and manure all over when slogging thru such.
#4 many of those had a standard transmission, which I like for most applications and times. A utility vehicle is not one of them. A clutch would get totally abused following along behind a cow/calf pair being moved gently at her own pace. And imagine jumping out to get a gate or to turn an animal the correct direction and have anyone available move that vehicle, wife, neighbor, grand kid.
#5 fuel economy the jeep will never match a mule.
#6 physical size, the jeep can't turn with a mule.
#7 the mule will rut soft fields much less.
#8 around here with a SMV hanging off the tailgate or headache rack I can use the road a bit with no issues and no license requirements if a 14 yr old is operating in my presence.
#9 in the same vein no bull crap about annual safety inspections, registration, license plates as it's a farm vehicle.
And thats just a few of my reasons,
you can have your jeep.
I have had jeeps, scouts and even an FJ-40 they had and have there place.