I think they have miscalculated badly here if the Newspack is indeed the cause of the Gutenberg fiasco. Gutenberg is a liability for writing and I’ve worked in news publishing before. Most platforms have journos under pressure to churn out articles fast. I don’t think the journos forced to use Gutenberg will be sending thank you cards either.
We may notice some well styled content, but for most news sites, content is longform writing (or short pieces) but it is very rarely styled majorly. The style comes from the themes and usability design and features. If news is going to be “encouraged” to produce content to include design elements, AMP is going to be very unhappy to lose entire sections of the content in addition to the journos whose work doubled.