Same here. After I sold my -7A, I was going to build a -12, until I found out about the trailer situation. As you said, it was a shame to waste the engineering that went into making wings removable/trailerable. Van's told me they didn't have the interest after the -12 came out, because they say the vast majority of -12 builders don't care about the removable wings & trailering. It's clear from this thread, and several other "-12 trailers" threads over the last few years, that there are some with quite an interest in trailering.
When I retire to my house in Kalifornia (after I sell all my guns that'll be illegal there), I'll probably go with Aerostar because they provide for the trailer option. I've already talked to people at some airports there about the idea of keeping the trailer at the airport as a portable "hangar". I could also probably fit it into my back yard.
Funny thing about the Aerostar trailer, though, is that it is not what people on these "-12 trailer" threads say is needed - a light, lightly sprung trailer designed for 800 pounds, not 6000. What people say we need, and I'd agree, is a trailer like a sailplane trailer - light and lightly sprung, and that can be towed with a car. The Aerostar trailer is every bit as stiff as a car hauler. It's also as heavy as a car hauler, and thus needs a big truck to pull it. I imagine it has the same suspension as a car hauler. I know it's so stiff you can't make it move up & down with your body weight at all. The Aerostar people claim it transports the Aerostar without any problems, though.