Perhaps that just means that they have both already reached perfection ;)
Seriously though, FastCGI is a very mature technology, so I can understand why development may have stopped. After all, when was the last time Apache made any changes to the way CGI works?
As for PersistentPerl, there is only one registered bug with the project on RT, and it is platform dependant (OSX), and includes a proposed fix.
Really, there are lots of perl modules that haven't had an upgrade in ages that are still relevant. How long did Apache::Session go without an update? HTML::Template has only had one release in the last 3 years and it is still very heavily used. I'm sure there are many others...