Maybe, but the painful fact that you can get a Focus ST wagon in Europe is kinda heartbreaking when its only brand-sibling equivalent over here is the ugly blob known as the slow-selilng C-Max.
Yes, trends have people buying more and more baby CUVs that have AWD but never even see dirt roads, and have an extra foot of bodywork height/weight compared to an equivalent wagon.
Subaru actually took risks like that, including WRX wagons. They're the most-loved freakin' car brand in our market right now, despite the fact that they're getting way too "normal", nowadays. In any case, a small "sportwagon" remains attractive to some of us (I'll bet more than 15), and would likely do decently with even moderate advertising effort.