Cannibalizing sales of more-premium seats is something to consider, but another consideration is how they compete against other airlines. If passengers were to

Cannibalizing sales of more-premium seats is something to consider, but another consideration is how they compete against other airlines. If passengers were to show a strong preference for these seats over traditional premium economy, they might switch airlines. But of course it remains to be seen whether passengers would these better, like them less, or have no strong preference.