Before revision:  While this effect alone would undermine EAS, there is a countervailing effect stemming from the disagreement between extreme voters, which makes the centrist voter pivotal and could potentially improve EAS. Thus increasing mass polarization and shrinking attention spans have ambiguous effects on EAS, whereas nuanced regulations of news aggregators unambiguously improve EAS and voter welfare.
After revision:  While this effect alone would undermine EAS, there is a countervailing effect stemming from the disagreement between extreme voters, which makes the centrist voter pivotal and could potentially enhance EAS. Overall, increasing mass polarization and shrinking attention spans have ambiguous effects on EAS, whereas nuanced regulations of news aggregators unambiguously improve EAS and voter welfare.