Yeah this. There are two things that work in our favor, one is that Falcon Heavy can (in theory) launch more quickly. And second, the mass needed to achieve a similar capability is greatly reduced due to materials technology.

The only missing piece is that it would be nice to use cryogenic fuels but these outgas over time so long duration is not a thing. Solving the on-orbit refueling puzzle would make this sort of endeavor pretty straight forward from a planning standpoint.