I refuse to pay for the same game twice.
There are no physical copies of WiiWare games. Once they disappear from the service, there will be no way to get them.
Obviously ownership isn't something that's important to you. I can't really explain why it's important to me for various reasons, including that I don't fully understand it myself. But it's something I value, and therefore, if it isn't offered, I will take my business elsewhere.