So what, exactly, does he need to change? We've had good offensive lines, and good offenses and won a lot, and most teams don't use a fullback so I'm not sure why someone suggested that. There is a large trove of evidence reinforcing what this coach and front office has done has worked - and a lot of people giving advice on what they should be doing. Based on....personal opinion? digestive distress? A game they saw live in 1958 with 6 running backs?
We have every reason to believe that with a healthy line, and few new pieces, we will be in the playoff hunt next year.