Crossing a few forum boundaries here with hope:
The wagon problem reminds me of the current state of mountain biking. Up until this year, it seemed like EVERY mfg was in a race to make darn near every bike lower (lousy pedaling in rugged terrain) and slacker up front (boring, truck-like handling in tight, snappy trails).
This made most bikes the equivalent of a fat rockered ski. Easy? Yup. Exciting and engaging? Not always. Dang it, I want an FIS slalom ski mtb equivalent in my quiver!
Luckily, recently, several bikes have been released bucking this trend at least a bit, by having a bit more travel than a pure xc race machine, but preserving some or most of their exciting, engaging handling:
Giant Trance
Trek Top Fuel
Yeti SB100
Pivot 429 SL
And others!
So, maybe wagons will make a comeback some day, like shorter travel, whippier mtbs have!