Not complaining about the cheats. For those interested in solving quickly, Googling the answers will never produce a record time. For those interested in 100%, it's still a last resort of frustration. AND, there are several quotes for which this will not work because they are Unattributed or Proverbs.
As for your suggestion of hiding the authors until the quote has been solved, dear God NO!!!! Sometimes, knowing who wrote/said something is the only way I can decipher archaic grammar (Alexander Pope, anyone?). Besides, there are a couple of quote-solving programs online that are about 80% effective and don't require you to know the author.
I'm not saying it's a bad idea if this were a new site, just don't impose it on us years down the line.
Slotted spoons don't hold much soup. - Stephen Sondheim