Hah, how weird. It's interesting on a technical level, but it's kind of pointless. The Virtual Boy is lacking in games, but if homebrewers want to address that, then they should be making NEW games. Nobody cares about ports, and even though the depth is cool, pretty much no one is going to want to give up both color and multiplayer if they're in the mood to play some SFII.
Granted, those who own both a Virtual Boy and the expensive flash cart would probably be excited for anything new they can toy around with on the system. I'd like a flash cart myself someday, if only to play stuff like Bound High, but I'm more inclined to collect the legit carts I've yet to acquire.