That’s not really the case.
Laca came with a name and stardom; Xhaka was not a nobody, he was good in Bundesliga; Mustafi was good at Valencia… I don’t see many of us have enough patience on them.
Back to your original response… nobody (or most) is happy with any player we have, is because we are not doing good enough. If we can’t change the manager, then the player(s) is the next one to be criticized.
If we play good football, serious competing in the league and Euro, I am sure the criticism will be a lot less.
Iwobi might have one good game against Everton, but for most of the season, he was the starter and we did not get the results. Someone got to take the blame, and I believe Ozil, Laca, and Sanchez all took their shares, and no exception to Iwobi.
However, when talk about changing players, it is normal that people want to keep the star players and get rid of the not-so-good ones.
If we can keep the winning streak and play good football, yes, we don’t really need to upgrade Iwobi’s position (so does the DM position). If we don’t do good enough, then he must be the first to get benched and we sure need an upgrade.