Oh god. xDD!
No, there's no threat for your Wii, only the fatigue of the optical laser, but the laser can be cleaned with a Dvd for clean, you can find it in Internet. The other way is to open your Wii and clean the optical laser by hand, but if you are'nt an expert i don't advise to do it.
seriously, I dont think a wii would break in 2months because you have bad media. I think it would take WAY LONGER than that. Plus wii lens are only 50bucks, jeez think of all the money you already saved.
If you really that terrified that your Wii laser lens will burn up and fry because your using dvd "backups", you shouldn't be using the "backups"... use a REAL disc (that means, go out and buy the game).
That goes for anyone scared of modding the Wii, and want 7 people to verify something for you. If your not willing to take the risk the first time (or in the case of the laser, at all), you shouldn't be willing to risk it ever.
The Wii laser is the same kind of laser in your xbox, or ps2... not the same drive, the same LASER eye...
It will wear out eventually, when is the question... 2 weeks, 2 years, 2 decades, 2 millennium? who knows!