Some months ago I asked this of Titzer myself, telling him that we'd gone through all the DVDs and that, of course, my boy could not read perfectly fluently. So, what's next in the program? I forget his full answer but the thing I took away is that you keep reading a lot to your child and be sure to move you finger under the words as you read. I am very sure that my boy has learned to read very well (around 2nd grade level, I think, before age 3) in large part because of this.
Another thing you can do is go through a phonics program, like my own "fleschcards":
http://www.mediafire.com/Fleschcards As I've explained elsewhere, I highly recommend this!