Which, of course, raises a question . . . why not just replace scro with hobgoblins? The scro role is being the organized, militaristic backbone of the goblinoid war fleets. In 5th edition, "goblinoid" is already more restricted in meaning than 2nd edition, and hobgoblins are already the organized, militaristic leaders of goblinoids at war.
By making the substitution, one avoids the whole "respectable, civilized threat versus contemptible, unenlightened barbarians" trope that was the whole essence of the scro vs. orcs dichotomy.