Maybe it will be possible to inject 32 or 64 MB DS games... but not more... (128 MB max for all dsiware, and i think there are limitations for one dsiware).
But i think we have to have the source code (we don't have this) to recompile a DS games to dsiware... So, don't wait something like a converter. Buy a flashcard.
If DS VC were to become a thing, we'd no longer have a need for flashcarts - not to mention it's more intuitive to just launch games from the Home Menu.