It's usually not wise to evaluate the significance of a dream or concept (today's term) car when first shown. It can take five or more years before the concept design can be compared to features appearing on production cars. The 1955 Motorama is long gone, so I thought it might be interesting to put one of its dream cars into a proper context.
The car I have in mind is the Oldsmobile 88 Delta, a hardtop (pillarless) coupe, a popular body type back then. I last mentioned it here when writing about odd dream car wheel openings. Oldsmobiles were redesigned for the 1954 model year and due for a 1957 restyling. The 88 Delta was probably designed during 1954 when the production '55 facelift was largely established and the basic body forms (though not all details) of the redesigned 1957s were known.
This makes me wonder what the point of the 88 Delta dream car design was. It wasn't way-out futuristic, one of those styling staff showoff jobs. Instead, with some changes to make it street-practical, it was basically what a future GM production car might have been.
Perhaps it, the Strato-Star and some other '55 Motorama dream cars represent a direction Harley Earl had in mind as his final designs before his 1958 retirement. Such cars would have appeared in the 1959 or 1960 model years. But the taut, finned, commercially successful 1957 Chrysler Corporation line provoked a rebellion in Earl's staff and GM styling took a direction different from that of the 88 Delta.