I anticipate mostly peaceful co-existence with bouts of horrifying violence. Basically, building stuff in space is expensive, fragile, and easy to destroy. Best way to avoid it is with a full implication of MAD. You don't smash my stuff with relativist rocks, I don't smash your stuff with nukes. Everyone lives and makes money.

Buuuuuut there are going to be political groups and potentially national entities that will constantly feel entitlement to violate this understanding. I suspect conflict will be more competitive than all out war. After all, blow shit up on earth and there's still land and atmosphere. Blow it up in space and there's nothing but wreckage.