"SORRY - but the one on the left is WAAAAAAYYYYY cooler than the one on the right." 

I disagree. To me, the newer one is sleeker, more sinister and deadly and just more "futureistic." The old one looks like a 1960s Monogram model. It was fine for the time progess changes your perspective. There are a few timeless classics - the gull wing Mercedes, maybe the Martian war machines from the original War of the Worlds... The original Enterprise looks dinky today. It doesn't detract from the enjoyment of the original series, but it would be silly not to take advantage of the opportunity to update the designs. 

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken