Don't think it'll have a long term effect on his future or confidence. I'd be willing to wager he starts next match. We don't have many other options either way.
Seems like he's tailor made for Chelsea. Solid defensive motivator. Not sure if the 3-5-2 would fly in Chelsea, or in the PL for that matter. Tbh I'd rather give Hiddnik a shot at a full season with players of his choice.