If anything the SUV/CUV is taking over the car market. Even Subaru's "sport wagons" are really just CUVs.
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So I would say it's not so much that "sport wagons" are coming back, they're just marketed as SUVs/CUVs. The term "wagon" is a death sentence - the word invokes images of the Griswold's Family Truckster. Ditto for mini vans - manufacturers are dropping them and replacing them with mega-CUVs like the Traverse or the Buick Enclave. They have all the function of a mini-van but without the homely styling and soccer-mom image.
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The big Crossovers like the aforementioned Traverse and Enclave, and also the Toyota Highlander, Honda Pilot, Ford Flex, etc, are moving into the space that was previously occupied by mid-sized BOF SUVs like the (previous generation) Explorer, 4runner, Xterra/Pathfinder, etc. (particularly true in the case of the Explorer and Pathfinder where their respective companies simply kept the same name but transformed the vehicle bearing that name from a truck-based RWD/4WD BOF SUV to a car-based FWD/AWD crossover. The fact that they are trying to appeal to the same market segment is apparent from the fact that they kept the vehicle name.)
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So as mid-sized BOF SUVs disappear (with the exception of the 4runner and the Jeep Wrangler, though I'd argue that the Jeep is in a class by itself) something has to move into the space previously occupied by the mid-sized BOF SUV. And IMO that is the mid-sized crew-cab pickup. Hence the Colorado/Canyon pickups from GM and the soon-to-be-introduced Ranger.
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This also holds true for full-sized SUVs. Now that the Suburban/Yukon XL, Tahoe/Yukon and Expedition/Navigator have gotten interiors that basically no longer have much in the way of "utility", the manufacturers have to have a vehicle that still appeals to those who DO want some utility in their full size truck, so the crew cab/short bed truck fills that market niche.
