Nancy, you've made many good points about blooper/skit fans and serious fans- thanks for your thoughtful post. While waiting for the film, a number of folks from the Depp forums who were previously unfamiliar with DS have started watching via Netflix or Youtube, and many have expressed newfound respect for the show. So regardless of how the film comes out, I think there are a lot of folks out there who have open minds and are interested in exploring the original series for what it was.
I personally believe they made Carolyn younger is if the series becomes a franchise then then they can use storylines as she grows up.
Here is a tiny snippet from an MTV interview with Johnny, speaking about his choice of look for DS. Hopefully it will allay some folks' fears: