Language development have not been &quot;stalled&quot;, it&#x27;s just mainly under the radar.<p>Some nice designs are out there, see Vobla and Pencil [1] for example, or Harlan [2] as another extreme.<p>[1] <a href="http:&#x2F;&#x2F;carp.doc.ic.ac.uk&#x2F;external&#x2F;dissemination.php" rel="nofollow">http:&#x2F;&#x2F;carp.doc.ic.ac.uk&#x2F;external&#x2F;dissemination.php</a><p>[2] <a href="http:&#x2F;&#x2F;blog.theincredibleholk.org&#x2F;blog&#x2F;2013&#x2F;06&#x2F;28&#x2F;announcing-the-release-of-harlan&#x2F;" rel="nofollow">http:&#x2F;&#x2F;blog.theincredibleholk.org&#x2F;blog&#x2F;2013&#x2F;06&#x2F;28&#x2F;announcing...</a>