After the failures of both "Jonah Hex" and "The Losers," those two movies will be the last lesser-known non-superhero characters in the DC library for a long time.
The reason why "Red" is at Summit and not at Warner is they consider it to be too small of a movie. They passed at the chance of making the movie more than once.
They consider it too small after the success of "The Dark Knight"($1 Billion). They are more interested in bigger DC characters and anything that doesn't measure up to "The Dark Knight" is low priority.
This is why Marvel is better at making movies than DC(in my opinion). DC only cares about doing movies that will guarantee them money, whereas Marvel does the characters that they are interested in seeing on the big screen.