If all players were on top form we may have a shot. However, outside of Pogba and de Gea we don't have any truly world class players. The league can be won with lesser players (See Leicester, Fergie's last season) but it takes a perfect storm.
Given the lack of signings in the areas we need to sign players, which is no fault of Mou's, I think it is perfectly reasonable to put a good chunk of the blame back on the board and Ed Woodward.