> Standing up and telling a roomful of high-leverage hires that their career trajectories are frozen for 2-3 years is probably not a winning strategy by itself. If I were a hungry startup founder, I'd read this as an invitation to ramp up recruiting.

This is how I read the article. This move is basically: the people already at the top removing the ladder behind them so fewer people can climb it. I wonder if the new criteria will be re-applied to those senior execs who already got through before the door closed.