I guess I don't see Charlie & the Chocolate Factory as a remake of Willy Wonka and the Chocolate Factory, so I don't see it as ruining anything.
They are two different interpretations of the story versus remakes like the Thomas Crown Affair where there is an attempt to remain truer to the original interpretation.
I like both versions; I prefer the Burton version for artistic value and the original version for camp and sentimental reasons since I grew up with it.
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I didn't realize it was taking place in a completely new timeframe until now:
The traditional tale has been freshened with a blast of girl power, courtesy of writer Linda Woolverton (Beauty and the Beast). Alice, 17, attends a party at a Victorian estate only to find she is about to be proposed to in front of hundreds of snooty society types. Off she runs, following a white rabbit into a hole and ending up in Wonderland, a place she visited 10 years before yet doesn't remember. (imdb.com)