who knows romulans may ask for peace after what happened to vulcan.
it may be a shock to the system at just how dangerous their unbridled passions can be.
as for romulan empire prime..
evidently it took a lot of time and war, conflict to keep it together.
they evidently had been dealing with internal wars just before balance of terror.
there already were signs things were coming apart ,, that draconian measures were not working as well.
now the homeworld and possible the entire solar system of the home world is gone.
it depends just how spread out was the romulan military infrastructure.
it could be civil war or a rebellion.