I find scala infinitely more readable than java. For starters I do not have to skip pages and pages of boilerplate, unless some genius decided to do 1 to 1 translation of his java code
I think the audience is the problem. Java devs prefer Java and Haskell devs prefer Haskell. Aside from some rare open minded individuals and people who have to write java, but would prefer to work with Haskell, Scala is up against a tough crowd.