I am curious if they are actually stocking these things. Not to mention rotating biodegradable supplies.
Biggest problem, which some have already somewhat alluded to, is that most situations are not "either-or". These bunkers are only useful in a CATASTROPHIC situation. You can't live in them full-time.
So, as Darkdwarf mentioned, you're at work or school or whatever when the disaster hits, and chances are you get killed there.
A better idea is to figure out how to make a living in a relatively safe part of the world, have your food AND WATER supplies stocked up, and as Japan has recently taught us, I think you need to consider radiation shielding and other counter-measures. You don't even need to have a nuke in your backyard melting down to ruin your day--you just need to be downwind from one.
I think I need to comment more on nukes. I think there is a hidden danger, that the Japanese have accidentally exposed, that probably also exists closer to home.
It's tied up with everything else. Just as I have been pointing out that we have dams all over the place that are at risk of failure due to lack of perpetual plans for maintenance and eventual removal or replacement before they exceed their life expectancy (assuming anyone ever bothered to think about that when they were built--the expectation was probably that at some time in the future "we" would keep an eye on them and notice when something needed to be done...), we will eventually have nukes that outlive the infrastructure and engineering capabilities needed to maintain them and, eventually, decommission them.
