Those are 1:6 scale vehicles though Nick, and a 1:6 scale vehicle is bigger than anything Hasbro's made or will make...
The 1:18 scale vehicles are full scale though, with no compromises, and they sell fairly well... For $45 I got the P-38 and the Stuka airplanes... Both are vastly more complex than the Gunship, both incorporate greater level of detail, both include pack-in pilot figures (with 18 points of articulation each AND accessories like stands and oxygen masks), both sold relatively well...
The Gunship is smaller, less detailed, no pack-in, and had to be clearanced. On top of it being hardly comparable to the aforementioned XD vehicles it wasn't to-scale and yet was priced similarly...
It just doesn't balance out.
I think Hasbro's capable of to-scale vehicles... I think even the Falcon, if they actually did it in sections, and did it properly, could sell well enough...
I'm not so sure about the AT-AT or a barge... They're less "known" or recognizeable than the Falcon.
Smaller ships like the Gunship, X-Wing (or any fighter/speeder), AT-ST, etc... Those things are easily done to-scale though. Some are really quite close (Including the gunship, it's substantially closer to scale than the Y-Wing, or something similar to that).
I think Hasbro's view on vehicles is more quantity over quality though... They try to push the vehicles in #'s that are too high.
Hasbro should stick more to accuracy I think than anything... The Saga Landspeeder sold super well, the TIE Bomber as well... Very accurately scaled and detailed ships that were new. Their pricepoints were lower, but they're not overly complex either. The size increase on a Gunship wouldn't increase cost as much (It's the # of molds made that increases costs generally rather than the size), so price shouldn't have been an issue.
It's working elsewhere though, and Hasbro's just not as interested in that it seems.
I'd honestly rather see no vehicles for the SW line than underscaled ones though. They just don't look right to me I guess.
I'm g oing to post this image in another thread, but I'll put it here too... This is BBi's new Blackhawk (Retail of $70 about)... Now, THIS is a BIG HONKIN' piece of plastic, and it's being made by a tiny tiny toy company, but look at that very reasonable price... Hasbro can do better is the point I think.