No, there are no plans to do that. Gantry 5 is a backend page builder and is a representative view of what you see on frontend (it's not true wysiwyg in backend). Gantry 5 offers a great deal more power and flexibility that other page builders. For example you can quickly and easily develop your own particles in TWIG and YAML whereas with page builder you tend to be stuck with what every components the developer provides. If SP page builder does what you want then there's no need to use Gantry 5 at all.
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