Way to go, Marines! Figure another 2 years before it's fully in service with the Corps, and then another year or so before it comes to a civvie dealer near you. If it's good enough for combat...
Back to mopeds vs. crappy roads etc.: Rather than counting on one solution for all conditions, best bet is to do an and/both, promoting as many as possible and letting people choose what works in their regions.
If you want to see what can be done in this regard, see also:
(the first URL takes you through the entire museum, the second is an index so you can go back and look up specific cars)
Frankly some of those are cool as hell and if anyone had the guts to manufacture them today they'd probably do well for that reason alone.
Typical fuel consumption was in the range of 60 - 90 mpg. and most of those were 1950s or earlier technology.
Here's an idea I've seen somewhere on the web. Basically it comes down to building a 3-wheel car with a moped power train.
In some places e.g. California, a 3-wheeler can be registered as a motorcycle. And, if the motor is below, I think it's 80 cc, then a 2-wheeler is a moped, and there's no reason an equivalent 3-wheeler wouldn't be also. In which case, no license or insurance requirements.
Ideal case might be: 80-cc diesel (if any such thing is made; I know you can get low-HP diesels for construction site applications, but I haven't heard of an 80-cc diesel yet, though there might be prototypes in certain hobbyist fields), driving a generator, powering an electric motor, and charging one or two 12-v car batteries in a PHEV configuration. This contraption drives a single rear wheel (no differential).
Then you have a tubular aluminum frame with two front wheels and conventional steering, and plain aluminum or similar bodywork whose only purpose is to keep the interior dry. Add a few amenities such as opening windows, a hatchback, a radio (radio, not "home entertainment system" transplanted into the car), etc. And of course extensive LED lighting all over the place so other drivers don't squish you.
Something like this could be sold as a "kit-car" with a fat disclaimer:-) It might only do 25 mph, but for buzzing around town it would be fine. Then at night plug it into the wall socket to recharge, and put another gallon of biodiesel in the tank every two or three months!