With the disclosure of the new bash bug (CVE-2014-6271, CVE-2014-7169), it seems timely to bring this up.
Dan added dash to core/base around seven years ago , intending the eventually link /bin/sh to dash instead of bash.
We didn't make the switch, supposedly due to the bashism in our scripts which had a #!/bin/sh shebang line?
Seven years passed.
Is there anything preventing us from making the switch from bash to dash as /bin/sh now? We can then have dash provide sh instead.