Others have already wrote some good responses but as this question is directly related to the grant request I submitted let me also address it.
in reply to Customers concerned about Web development using Perl
Most of the Perl-using companies I talked to have problems finding Perl developers. Some companies have already decided to move away from Perl as they cannot find Perl developers and they see it as a risk. Even if they cannot really replace Perl with some other language they'll prefer to start new projects in other languages.
Some people suggested to ensure business continuity even if you go bust. You might even consider releasing your CMS under and open source license. That will eliminate some of their concerns. Especially if you can build a community around the product.
Some companies care of the language just because of the hype surrounding it. I believe we will be better off by creating some more noise around Perl.
Other companies don't really care about the language and technology you use as long as they can be sure they can replace you in case they want to or in case you go bust.
For them what counts is the perceived popularity of the language and the availability of programmers.