I would be surprised if more than 5% of people who do Introductory EA fellowships make a high impact career change.
Do you have a sense of the fraction of people who do introductory fellowships, then make some attempt at a high impact career change? A mundane way for this 5% to happen would be if lots of people apply to a bunch of jobs or degree programs, some of which are high impact, then go with something lower impact before getting an offer for anything high impact.
Do you have a sense of the fraction of people who do introductory fellowships, then make some attempt at a high impact career change? A mundane way for this 5% to happen would be if lots of people apply to a bunch of jobs or degree programs, some of which are high impact, then go with something lower impact before getting an offer for anything high impact.