Not so much a vehicle, and I know Hasbro has said they aren't going to do playsets, per se. But how about some kind of battlement set? You know something with a generic wall and maybe a turret or something. Maybe even have connectors at the end to snap two (or more) pieces together like the Cantina bar sections. I'm sure lots of little kids would like to do something like that scene from Starship Troopers where they fight from that field assembled base...
It could be pretty simple and Hasbro could incorporate it within a Ultimate Battlepack or something. Basically have a base, a wall, a turret and maybe a gate. Then they can either fill out the pack with OT, PT or EU figures. Heck, they could even paint it different schemes (Snowy, sandy, dirty, etc.). Then to spread the cost they could repack it in their other lines, (GI Joe, etc.).
My thinking is that most of the buyers of the BMF and AT-TE probably don't do a ton of flying/walking them around. They don't utilize their vehicle function so muc as they primarily use them as a basis to play with the figures. And since there aren't a huge number of ships that are iconic/saga spanning like the BMF or as heavily used in the PT/Clone Wars as the AT-TE, I think Hasbro should look at something somewhat generic that they can apply treatment to, in order to sell multiple times (think repainted ROTS clones...).
So does anyone think a set where you can have a line of Troopers (and maybe a PT version of an E-Web) firing down on SBDs and Tri-Droids, or some Rebels bravely holding off an onslaught of 50 Stormies) seem like a good idea?