I suppose having the galactic state of affairs be somewhat of a parallel to things in the OT does offer something fittingly parallel for Luke to forsake, especially related to a new call to adventure with his father’s lightsaber.
I can see how TLJ, being written by someone receiving TFA as a complete entity in need of a follow-up, would want to set it up like that. It gives Luke something to rise to and comment on the phenomena of galactic civil war itself, transcending the concrete manifestations of it, just as Luke does so with himself, becoming a legend and departing this mortal coil.
That is an interesting way of looking at it, although technically Luke did forsake his calling long before the FO took over so to speak. I also believe the same sentiment could have been achieved by having the New Republic losing ground rapidly in the wake of the events of TFA, rather than writing it out of the story, and turning the Resistance into rebels overnight. There were also interesting parallels to be made between the FO and terrorism in our real world, where Kylo Ren’s dedication to Snoke was similar to those indoctrinated by extremist ideologies; that and the FO’s position in TFA mirrored the position of the rebels in ANH, begging the question what the difference is between rebels and terrorists, and why Ben Solo might consider himself a rebel.