Google always treated AMP as permanent, even going as far as to introduce AMP Emails*, and slowing down non-AMP javascript content. It was only because of legal

Google always treated AMP as permanent, even going as far as to introduce AMP Emails*, and slowing down non-AMP javascript content. It was only because of legal exposure created by the slowdown that they were forced to deemphasize AMP. * Nothing says 'temporary' more than introducing a tech to a form of communication which is expected to remain readable basically forever.