I doubt it because Man Utd are not the title challenging team we were before so players are getting away with slackness much more than during Ferguson's years when we had to win every game. We have won less than half our games and play in the Europa. If De Gea was given time to develop and make mistakes during our Fergie "win at all costs" era then I am sure an academy graduate from Lancashire, playing for a much less successful United, will be given time to iron errors out of his game. Even our manager isn't a proven top level winning manager so there will be more concessions made.
there was a difference playing for Atletico and Fergies United yet De Gea still got picked through the errors and United are a lot closer to Sheffield United now (if you check the table). We are not a title topping team and he is an academy player so he will get away with a lot more, because he cost us nothing and we are far from a side ready to challenge. Its better to test him out now, before we actually get to that level and find out he isn't capable.