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It's also pretty annoying if your are stuck in the middle of the desert because you opted not to use wheel 4.0. In the end it's all about statistics. What is more likely to happen? A wheel 4.0 fail, or getting stuck with wheel 1.0 (where 4.0 would have helped)... The first likelyness is constantly decreasing with wheel 4.1, 4.2, 4.9 etc whereas the first one stays constant. At least at some point in time wheel 4.0 should be preferred.

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In reliability engineering, the failure rate for a complex system is the sum of the individual failure rates of its components [1]. I will let you do the math.

[1] https://en.wikipedia.org/wiki/Failure_rate#Additivity

I somehow doubt that this system would perform so much better than e.g. removing air from a tyre or putting one of those metal boards under it that it would justify the increased complexity (and cost) over normal tires. I mean okay, you don't have to get out anymore, great. For deflating tires that isn't the case either anymore.

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