ok i have read a couple pages so forgive me if this rehashes or neglects some previously covered fact (not to mention my likely false memories of the shows history) .... i have a couple new theories on the fail safe, swan station, skinner box etc people seem to be debating ... totally unfounded and just conceived but hear me out ...
for DI it was never a skinner box, they used it and thoughtfully observed the people in there because they knew it was important... thats if there wasnt a downright normal rotation schedule, despite the odd short interval of presses... because once upon a time the swan station was fully operational, right? ... before ben et all killed the DI, but after the station was built (all in the timeline where shit didnt go blooey)?
Well during that time, they needed to contain this energy they inadvertently released ... but they are dealing with unknown natural forces, in quantities no one has ever before ... the pushing of the button, and its necessity were all an immediate solution to this accident, at least as immediate as possible ... so upon setting the station up and discovering this fluctuating energy they devise the temporary solution of the button press ... and heres where my theory really starts:
desmond didnt need to push the button, jacob wanted him to...the magnetic force however bad, would have passed and gone still .... afterall the machine wasnt set up originally, the fluctuations had to go un-neutralized at one point, right? and the world didnt implode then? ... I mean the station was built, so it's fluctuated in oen way or another, whether its how frequently it happens, or the strength itself ... othewise the station couldnt have been finished or occupied, right?
And the numbers do make a difference, its not random or some psychological experiment, at least it wasnt initially ... the numbers control the response the machine gives to neutralize the energy or whatever it does ... the energy has changed or worsened, so it would make sense they noticed and ended up devising or modifying a system that could adapt to its worsening... (and the failsafe could be part of that, a therotical last option/final solution should it get so much worse that no settings on the other can contain it) ... however it doesn't worsen past a point, plateaus, and therefore becomes a system where the same buttons get pressed over and over again... partly because before it can be modified the island is taken over by the others ...
Once they have their people in charge of the station, there are many different scenarios that could create the observation and or swan skinner box we now know.... whether its jacob interceding and telling them to do something, or rather not do something (e.g. desertion of the station and krazinsky), blind trust in unstable and suicidal krazinsky, 30 years of cabin fever, the actual fever or sickness ... point is, with jacob's apparent omniscience of events, the other's apparent predilection for mind games, and their people observing and manning the station, in 30 years it could have easily (and intentionally) eroded into the situation desmond and the castaways stumbled upon... And it was, by jacob, and all for the reason that the failsafe would finally be activated and he could get whatever net result he wanted.
And yeah I guess jacob could have just said go turn the key, but he could also just say the smokes the bad guy, im a god, here's what we need to do, etc... plus it seems like its all part of a plan that had to take place in time, with our heroes getting there.... in other words, he needed 30 years.
But the key points, it was jacob, and the majority of the swan's machines and systems were legitimate, and there's a real plausible solution that will be revealed as to how and why it all got where desmond turned the key.... I mean this is something they conceived after season one, and focused HEAVILY upon for all of season two... I have to believe they have a logical, even if magical or jacob-derived, explanation for it all.
P.S. if the interval between energy being released was fluctuating, it could be the others who added the timer ... its not so tech-releated, and it has those egyptian symbols... so perhaps it was even still in fluctuation when the DI got taken over, and the final timer was added when it eventually plateaued.