I would say that the move and stadium redevelopment has come at the worst possible time for the team in terms of on the pitch. We dropped 4 points at WHL last season. It's a subjective arguement so I can't put a number on it, but I'm fairly confident we would have amassed more points at home this season than we did last season season.
I agree with the defensive unit being the key factor for team's relatively dip compared to last season.
While I totally agree we would have got more points at WHL, it may actually have come at the best possible time.
At some point we had to make the move.
It's quite possible City will get to 100 points this season, we would never have beaten that.
We look on track for a CL finish, maybe even a FA cup final (if we win the FA cup, no question in my mind playing the semi & final at "home" would have been a factor)
Under the new rules, 4th or 2nd really isn't a major difference.
If we start next season in new WHL, with CL football and Chelsea & Scum in EL, it's a very good place for us.