How can we do worse? I don't care if we win against Milan or Inter when our players are always motivated and run their ass of on the pitch. Del Neri can't do such against small teams and sadly it's visible week after week. I simply don't care about those 3 points if we're going to drop points against teams like Parma and Lecce almost every single week. I'd rather see us lose big matches but terrorize small teams when we give their best.
Compared to Ciro, Zac or some other coach we simply aren't any better. We only score more, but we also conceded more. Looking at our standings, there's no progress.
Sticking to Del Neri makes no sense now because we're not 4th and fighting for that spot. In that position it might be tough to sack him. But not now when we don't see anything out there.
People said we weren't fighting for 4th three games ago, yet we were again before this game started. Now we're not? Maybe after two games we will be again? You see where I'm going.
Assuming a new coach will come in and get results is positive, it can work at least in the short term, but if it doesn't then you have a coach stuck with a squad he didn't assemble. So yes, it can get worse, we can lose more often. You say there is no progress but I see the structure of a team at least. It's lacking quality and a good player in two areas, but last season we had 11 individuals every week.
No matter the coach we seem to have a big problem playing against some of the smaller sides, as you say.