I have been using Scala at work for around 2 years now. While it has been a fairly decent uphill battle, I am fairly confident that Clojure would have been rejected without a thought. Of course, that doesn't mean Clojure is bad. I'm just giving you my guess about my work situation.
I think a big thing that could help Scala is that you can write code that looks a lot like Java. However, as I get more comfortable with Scala, the desire to do things more Scala-like grows;)
A big Scala complaint has been
IDE tooling. From what I know, IntelliJ is pretty good, but many people want Eclipse. Supposedly, Scala's creator, Martin Odersky, has recently become personally involved with getting Scala and Eclipse to play nice. For me, I generally do not write Scala code in an IDE. I use Vim +
Maven + SBT. However, I use Eclipse to debug Scala code. A co-worker does almost all his Scala development in IntelliJ.
One other thing, I am doing fairly straightforward work with Scala. A lot of times I see Scala mentioned, the conversations seem more Haskell-like than Java-like. I hope this doesn't turn people off to the fact that you can use Scala as Java + some nice control structures + closures, which are things most new languages seem to have.