Which I think is absolutely correct. Going into games with a 2 man midfield would be suicide. We already struggle for possession as it is.
In the promotion season we managed to make our formation look like 3-5-2 with the wing backs being "midfielders" as much as "defenders", often helping the central midfielders with closing down, pressing etc. At times Duffy dropped deeper, alongside the two central midfielders, again making it a 5 across midfield. We were so good that opposition teams focused more on how to stop us, than how to cause us problems.
What's happened now is that our wing backs are being forced deeper to deal with opposition wide men, who cannot be left alone with our wide centre backs. We're finding it hard to keep possession and have to do a lot of defending.
When the opposition switch play our three central midfielders have to work hard to push across and to keep behind the ball with correct/optimal distances between themselves, and our defenders. We're just about getting by at the moment, and we've selected our fittest midfielders to cope.
So at the moment I think it seems necessary to do all these defensive tweaks and yes it does seem suicidal to have two strikers AND a number 10 behind them. Although McGoldrick is working hard he can't cover as much space as our midfield trio is doing. I agree that we will effectively be left with two midfielders (note that we'we gone from 5 to 2) in a lot of situations.
I think Wilder had the tough October fixtures in mind when choosing the current tactics. Fulham may be a bit different, but the plan has been to stay in these games, take our chances and get something while achieving defensive solidity, which will be absolute key to us. We've not had much luck so far though.