Will other page builders be supported, beyond Elementor?

In general: This is planned middle to long-term. Nothing is set in stone yet.

For “Beaver Builder”, “Thrive Architect” and “Brizy” there are plans to release an Add-On for each one but no features or date is being set yet.

(Note: For a Page Builder to be considered for adding support it should be working without Shortcodes, as those Shortcode-based Builders will obviously have no bright future…!)