I think so. Thoughtworks, who are a straight-up corporate consultancy, have done Ruby since 2006. Ruby is certainly further along the adoption curve than Scala, so perhaps DPP is trying to leapfrog over the adoption of Scala by adding JRuby support. However, IMO Scala is not what is holding Lift back -- it's lack of decent documentation. Just read the other comments on this post...

My personal impression, backed by no real data, is that Ruby adoption has tapered off somewhat. Python and PHP web frameworks have absorbed the innovations of Rails and the subjective advantages of Ruby as a language over either aren't enough to close the gap.

I wouldn't say that Ruby or Rails are dying but it also doesn't seem to me that they've achieved escape velocity either.