Consider this—say the EA figured out the number of people the problem could affect negatively (i.e) the scale. Then even if there is a small probability that the EA could make a difference shouldn’t they have just taken it? Also even if the EA couldn’t avert the crisis despite their best attempts they still get career capital, right?
Another point to consider—IMHO, EA ideas have a certain dynamic of going against the grain. It challenged the established practices of charitable giving that existed for a long time. So an EA might be inspired by this and indeed go against the established central bank theory to work on a more neglected idea. In fact, there is at least some anecdotal evidence to believe that not enough people critique the Fed. So it is quite neglected.