That's certainly an option, but choosing which subreddits to replace leadership on is a very tricky task. You can't realistically say all subs and picking and choosing will cause riot if there's any possibility of political reasoning. The way I see it they'd need guidelines that are automatically enforced. Even then though some subreddits work quite well with extremely strict, almost echo chamber, levels of moderation. For example it would really be a shame if askscience or askhistorians were caught up in it even though they're very strict with what they allow.