One also has to consider that releasing more stats isn't "free" for FFG. It would take manpower to do so as it would require a lot of playtesting, etc. to make sur ethe balance was right. And although they could offset this by having a specific "real-world vehicles" supplement book, that book would lose that synergy they have where buying one product means you want (or need) to buy another product. If I bought a supplement like that, I would spend the next few months buying and painting 1:48 Tamiya tank models probably, and as fun as that would be, that would be Dust money that wasn't going into FFG's pockets.
But as I said, doing it would draw in more people, but would cause people who are playing Dust to spend money on non-FFG products. Both are certainly true - the question is which would be greater. It's clear at this point that FFG sees it as being detrimental to go that route, so I doubt we will ever see it happen. If anything, we might down the line see FFG release models of tanks and jeeps that are slightly modified with Vk technology - thus letting people use more regular vehicles while adding a sci-fi touch to keep the theme of the game and keep people buying FFG products. And that would be fine with me too.
Please. The extra manpower is neglible. Armor 1, 1 health per unit member, move 1, M1 AR. There, done. Maybe knife! Done. Lower the value against A1 to 1/1 instead of 2/1 to show a different level of training. There you go, basic allied infantry.
Same goes for tanks, you have a range of weapon sizes already and all you really need to do is publish 3 types of tanks, light, medium, heavy and fill in the gaps.
Finally, the hardest part, other vehicles. Again though, its merely deciding what stats you want to give them. Its an excellent assignment for interns or a training project for those who are recently hired and they can test play it right there at work or with a limited number of fans from the forums.
And the last step is to sell them, either as official cards (so they can make more money) or as a PDF that coswts $5 (so they can make some money).