I don't think it's that important. Lord of the Lands can get us more habitable space, yeah, but it would only be just a difference between current tens of billions population in just the pockets, and possible future hundreds of billions or even trillions of population across the whole realm. Do we really need it? I personally don't see why we would.Thing is, part of countering Pockets of Safty is Lord of the Land.
Lord of the Land is essentially terraforming powers.
So that is not avoidable if pockets are choosen.
And defence features of the Lord of the Lands are not required because the realm has these defence features as it is.
On the other hand, without the Lord of the Land we still have current circular safe strip of mostly good terrain with five densely populated cities with tens of billions of inhabitants overall, that's already so many. And in the future there would be more standard expansion options, into the forests of the circular strip and even into the nearby wilds with domed cities and underground arcologies, as I remember Yog mentioned it.