I very much doubt Pope Francis would tinker with the content of the extraordinary form. No reason to create yet another liturgy in the Roman Rite halfway between the ordinary and extraordinary forms and create more liturgical mess. I wouldn’t be surprised, however, if he tries to restrict the EF, e.g., by requiring the bishop’s permission, as suggested.
The one manner of change Archibold suggested Francis could impose might be enough to deal us a terrible blow: to unilaterally impose the utterly novel and foreign (read: un-Roman) lectionary of the Ordinary Form into the Extraordinary Form. (The more I watch, the more I am convinced Klaus Gamber was right... the "ritus modernus" is not really Roman.)
The resulting monstrosity would be a rite that too "Roman" to be modern and too modern to really be the usus antiquior, and would be rejected by all... forcing us to choose between obedience to the present authority and obedience to the "democracy of the dead" that is our Tradition. This is precisely the conundrum that Archibold sets up.