the original wonka movie was a classic, but it should be noted that Wilder's version of Wonka, while great in its own right, really wasn't that close to the book's version of wonka. it was toned down heavily for the movie and given a lot "nicer" of sillier nature.
I am looking forward to this movie, not to replace the original movie, but as finally a more faithful adaption of a classic and fantastic book. As good as the original movie was, it was a shit adaptation of the first book.
as someone else said, comparing the two movies will be pointless yet inevitable. the original was meant to be a movie heavily inspired by the book yet made directly for kids at the same time. this looks to be much more adapted from the book, which while for kids really wasn't for kids in the same sense of a kids movie, especially one from 30-40 years ago.