Bitcoin is economically broken at the fundamental level with respect to support reward for POW. This because it will always approach net zero no matter what.
PoW is economically broken because the margins tend towards zero? Seriously?
Yes. It means that to attack Bitcoin one must only make the reward higher to do so. And if the reward for supporting Bitcoin tends toward zero the cost of doing so is fairly minimal.
Not exactly... because even if the net profit tends toward slightly above breakeven, the gross rewards still ensure a high network hashrate which cannot be attacked without suffering major financial losses.
Still makes more sense to participate in the network (or not at all) than to attack it.