Addressing the claim “How would you solve the problem of humans becoming totally dependent on computers?”

The idea of human beings being totally dependent on computers first requires one to imagine the world in which this dependency exists. I am going to define dependent as necessary for survival, because otherwise, removing computers would simply be an inconvenience and this thought exercise would be irrelevant. So I am imagining finding myself living in a future where the infrastructure is computerized and the mass failure or shutdown of the computers would cause human extinction and I am tasked to finding a backup plan in the event this were to happen.
I would approach the problem like I do any other problem and begin listing out the variables and assigning a measure of scale to each factor. I’d set these variables up in a simple statistical analysis similar to Drake’s Equation and determine the probability of failure then create a series of proposed improvements / countermeasure for each variable. Next I would prioritize the implementation by those providing the largest improvement then working through each one until the overall probability was as close to zero as possible.

Given the probability could never be brought to zero, it would make sense to create an alternative infrastructure in parallel that would provide human survivability in the event the computerized infrastructure shut down.
A maintenance plan would also need to be put in place and continuously tested to ensure the redundant infrastructure would indeed work in the event of a crisis.

Given this solution, it makes sense to consider what some of those variables might be. Human beings biologically have easily identifiable needs that can be triaged quite easily. First and foremost is oxygen uptake and carbon dioxide emission, human beings can only survive a matter of minutes in an environment without oxygen or saturated with carbon dioxide. The logical next variable is any derivative on the first, any type of pollutant or respired chemical which effectively blocks the uptake of oxygen or emission of carbon dioxide. Biologically, the next priority is access to suitable drinking water for hydration. Environmental factors alter the rate of dehydration, but it is still a matter of around a couple weeks in which human beings can survive without water. Next on the list is food, or nutrients and minerals required for proper metabolic function. There are hundreds of nutrients and minerals needed at different quantities and frequencies in order for human beings to carry on proper metabolic function, and all these nutrients can be prioritized based on their depletion in the body and how much interruption a shortage of the nutrient has on metabolism. If starved of any essential nutrient for long enough produces debilitating and eventually fatal results. Nutritional needs are on the timeline of months in most cases, so we are getting lower in the list. Next comes protection of the body from the environment by means of clothing and shelter. The given environment is a major factor in determining the chances of survival, but in almost any environment being fully exposed to it will be detrimental and likely lead to death. The next priority on the list is related to the environment, which is exposure to pathogens and environmental health hazards. Human beings likely need some type of access to health care for long term survivability and proper longevity of life, so general health care, dentistry, and similar services are essential but perhaps border line essential to overall human survivability. Lastly, social welfare and civility are the final variable on my list. Even though it is unlikely, there is a possibility that a collapse of society could easily pressure one or more of the other variables so much so that it threatens survivability.

Maybe the equation would look something like this:

Equation Available Upon Request

Ps(t2-t1) = probability of survival over time interval; O2 = oxygen; Nx = Essential Nutrient; EP = Environmental Protection; HC = Health Care; C = Civility and Social Welfare; Z = Z-factor * Note this is certainly an incomplete list so a Z-factor is added to represent unknowns.