There are very few options after Hill. More importantly though, especially if we only get him for one year, is that Hill can help mentor the likes of Giddens and Walker much like Cassell did for Rondo.
People are also really underestimating Hill's ability to play point forward. What that means is that we can actually get Eddie House to play scorer on offense without having him to guard opposing SG's on defense (like we had this year when Marbury ran point and having Eddy get torched on every defensive possession by Gordon or Cliff Lee)