Their are hundreds of applications in the Diablo(& prior) repositories of programs lots of people using on a fairly consistant basis.
The original authors/porters may or may not be interested (or be even around any more) in porting it to Fremantle. Their needs to be some way for developers who are willing to just port existing applications, and/or take ownership and revamp the interface to be consistant with the new UI.
Talk Thread: http://talk.maemo.org/showthread.php?p=357594