not necessarily...
i forsee 2 possible ways of solution that would not hurt the download service
step 1, clean out wii of VC/Wiiware games
step 2 install new channel "External games"
step 3 download all games over again to SD- they "install with the channel look etc,
to play... click new channel, it comes up with all your stored games on SD. click on the game you want to play, then it either,
1: starts playing the game from the SD card
or
2: quickly copies file from SD card to internal and starts playing, when you end the game it copies file back to SD card making room for next game.