I wouldn't be too surprised if the number was near 50% or so, but the survey was certainly conducted in a poor (read voluntary, not random) manner.
The truth is, the value of a console, and price of it even, is small compared to the overall value of the games spent on a console. That would help explain the fact that only 4% of people said that hardware reliability was a breaking-point issue for them. Not only that, but the value of the console itself is the games, as well as the community.
Face it, X-Box Live is just built more successfully, even with the issues that it has. My 360 failed once, either on ME or Halo, but the sequence to get it fixed wasn't too bad. Considering the amount of abuse (I used to take it people's places and such), it lasted longer than I had expected.
As for the Wii, I know far too many people who let theirs sit in the corner. I love some of the games, but in the end, a lot of amusing things got old.