Thanks! Hope to see you in there.
We're actually discussing this now. Here's what I said to another player:
As it stands right now the search-space is massive, any line or collection of lines from any Movie ever. But once we get more specific, that search-space shrinks dramatically and brute-forcing is a real and fair possibility.
Additionally, One thing we are likely to do is post a second challenge tonight, which has a smaller bounty, and therefore, smaller hint prices. This will hopefully let people try the game out, with a much smaller investment.