It would be awesome if after the kernel exploit is released, someone makes a site called exploitmykernel.com that allows users to launch the RPC client on their computer, enter their computer's IP on the Wii U, and then be forwarded to a page that starts the RPC connection.
This is not dependent on a kernal exploit. This can be done with the webkit exploit alone, just build rpc.c in the wii-userspace repo. The trick needed would be to edit the hex payload in javascript to alter the IP address.