if it was done (the halving) every year, right now miners would be fucked basically
So how does it change the things
now, before the next halving? If the halving weren't as rare as it is, would the miners have
already been fucked by now? If they would (which seems to be your point), I see no reason why they won't be ruined by
this halving...
What goes around comes about
it change the thing because they had time to improve the efficiency, now they have a better efficiency and can sustain the halving even with a <<<$100 price, if the halving was every years they would still be with the efficiency of 2011....
A better efficiency is fully accommodated over time by the rising difficulty, so we are effectively time-invariant in the
long run (efficiency vs difficulty), i.e. the halving interval is irrelevant if we still hit the efficiency wall before the halving. In other words, your assumption would hold true only if (and for as long as) the efficiency outpaces the difficulty. Previously, this condition had been satisfied by the new more efficient equipment hitting the market on a pretty regular basis...
But now we seem to be well past that point
difficulty will not increase if the price do not increase, so no one can not rely on difficulty and dismiss the impact of the halving, for the efficiency
satoshi predicted that the price would be increased slowly not in few years, this was another reason for the halving