When a design is only a few years old and it doesn't have the quality or beauty to become iconic, architects are free to make adjustments to just about anything and call them "improvements." Case in point, the 2010 Honda Accord versus that 1978 Honda Accord. Besides the brand, there's nothing terribly "Accord-ish" that necessarily needed to be kept alive for three decades.
But the Starship Enterprise is an iconic design. Over four decades, it has become so engrained upon the public's conscience that it's recognizable just by silhouette. So in that instance, it's less like a car and more like a face. You change some element of the face, and you change its expression. Imagine performing plastic surgery to Jay Leno, then showing off his silhouette in profile, with a rounder face and a rounded-down chin. People would wince and say, "Who's that supposed to be?"
Granted, everybody in the last Star Trek movie has new faces. If you can accept Simon Pegg as Scotty, you can accept the new design of the starship as the Enterprise. Certain things have to be changed about the look and feel of the entire show...but certain things should have been left absolutely untouched. And one is the general profile of the Enterprise.
The reason the refit design from the 1979 movie worked was because the iconic proportions from the original design were left intact. The engines were replaced, but kept at the same angle. Otherwise, the new changes were applied to the original frame, as though a new shell were added to the classic chassis. So the deflector dish rested at the same angle with respect to the lower "nipple" of the primary hull, and the engine line rested just above the dish but not higher than the peak of the bridge.
I know what the producers of the 2009 movie wanted was a "hot-rod" Enterprise. But first and foremost, the unseen geometric rules that govern this ship should have remained intact; from there, an entirely new ship could have been built along those lines and still been as iconic as the original Enterprise. I would not have tucked the secondary fuselage closer to the hull and further forward; it makes the ship look like it has an overbite. I would not have replaced the engines with elongated dead locust shells and hoisted them higher like someone surrendering to the Klingons.
Actually, I would venture that
judexavier is closer to the vision I would have preferred for a rethought ship with a '50s "hot rod" style, than any other concept I've seen:
http://i248.photobucket.com/albums/gg178/judexavier/DSCN0894ExteriorMJupload02.jpg
The essential proportions are all still there; and as you can see, he was studying Matt Jeffries' drawings when he made it. In one of those drawings (at lower left), you can see the very proportion lines I'm talking about -- the distances, the spaces, the angles -- that make this ship, and any other ship based on it, flow elegantly and appear balanced and buoyant. The 2009 Enterprise isn't ugly, but it's imbalanced, like it's had plastic surgery and the bandages haven't all come off.
So what would I do? I'd take Jeffries' proportions, open up some Syd Mead inspirations, get out a model of a Studebaker Avanti, a '63 Corvette Stingray, and a Jaguar E-type, and build a polished shell around the face and body that everyone already knows. You don't have to reinvent the wheel to polish up the Enterprise.
DF "Imagines Replacing the Starfleet Pennant with the Crossed Flags" Scott