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I really don’t think the premise that WordPress market share is going to be eaten by JAM stack in any meaningful way is backed up by any of this.

WordPress is chosen by companies, not developers, because it is an extremely safe chose of CMS. JAM is not a CMS and none of the JAM CMS are anywhere near as safe of a business choice as WP. It’s also no surprise that a survey of JavaScript developers doesn’t favor a PHP software.