Move ctm to ports?

[Stephen Montgomery-Smith]

How would people feel about removing ctm and mkctm from the base system, 
and making it into a port?

One advantage is that changes to ctm (like allowing different 
compression programs, or incorporating svn into ctm) can be made 
relatively quickly.  For example, the following PR has not been acted upon:
http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/159665

Also, if I want svn incorporated into ctm, then it will need the 
subversion port as a dependency.

What would the disadvantages be?