This still makes no sense, unless you have spare PSUs lying around your console will still be useless. Unless you are talking only about having to unplug your console from your tv and rest of your stuff.
Are the PSUs usually the first parts to fail and how often? Because in last ~15 years I have only had one or two die on me with my pc.
Anyway we are getting off topic and this isn't really a problem.
That depends. The worst (e.g. Hercules) can fail spectacularly at well below their advertised voltage, while the best (e.g. Seasonic) will have failure rates around 2-3% if not lower.
PSUs are one place where you usually do get what you pay for.