"100% Pointless" is a bit extreme
I'm completely aware of the fact that "It's for use on actual Wii hardware" but nonetheless I'm sure many people would love to have only one drive that would hold all of their wii games and that could be used on both PCs and actual Nintendo Wii consoles. It would be extremely convenient and would save hard drive space as it would avoid redundant copies of the isos.
Even if WBFS was originally designed for Wanikoko's application, it has now become the standard for all current Nintendo Wii loaders. I see no reason why the dolphin team should be reluctant to add WBFS as a feature.