I think that it is a possibility that Opera could totally be controlled by the users voice. However this would require the microphone rumour to be true.
A few bits of information lead to this idea. They were:
- Nintendo being issued a patent to do with voice recognition technology.
- Opera for PC can be controlled by voice, I think it is only for commands like 'back' etc., not as a substitute for typing.
- I read an interview with someone from Opera who said that controlling it on Wii will be "as easy, if not easier than controlling it on a PC".
My guess would be that if it is controlled by voice, you could also use an onscreen keyboard aswell, because I'm sure some people wouldn't like using their voice and some words would need to be typed in manually.