There was a decent chance Dems could retake the Senate, or at least move it to 50-50. Retaking the House? Wasn't going to happen. Dems might have netted 12 or 15 rather than 6 like they actually did, but netting the 30 they needed wasn't on the table.
No need to play Captain Obvious. We all know it's not a realistic scenario, but that doesn't mean it's not interesting to discuss what would have happened.
Politics is not simply a box score. Without an explanation for how an event might happen, especially one that as you just admitted could hot have happened by random chance alone, there's nothing worth discussing about potential effects of that event,