Why, you ask? As ideas continues to develop and come closer to perfection, the only reason for anyone to use dualis would be for development, effectively cutting away the userbase that wanted to *play* homebrew games. Wouldn't you rather use a single emulator to play both your backups and homebrew games, rather than 2?
Now, because Dualis will lose this user database, homebrew developers may turn toward ideas in creating games, because their target audience, the homebrew game players, will have turned to that emulator as well. The homebrew developers will want to test their creations on the software that the user will be using to run or test the games, so Dualis will no longer have any following whatsoever.
The only option, as I see it, is for Dualis to open itself up to commercial roms, or it's going to die.
Long live ideas.