It's a huge problem when there's the sheep who attacks the wolf in sheep's clothing and the poorer-eyesight sheep can't see the truth. It's a problem when wolves are welcomed into the flock just because they look like sheep. Unlike the illustration above of the obvious disguise, remember that the statement, "Wolf in sheep's clothing." is a figure of speech and not meant to be taken literally. Some wolves in sheep's clothing are obvious but others are subtle. Some look like a man of God, they look gentle and harmless but they are in fact ravening wolves waiting to devour the flock.
Many false prophets come today and it's very easy to get deceived at times. Unlike the caricature of a wolf in sheep's clothing, the deception may not be not obvious at all. The Pharisees were the biggest deception in Jesus' day because while they looked like men of God, they were religious con men. Later, the deadly religion of the Pharisees ended up "evolving" into Roman Catholicism which is the biggest con job that looks like Christianity but it isn't Christianity. There are also pastors or cults that go with fancy names that while you may think they are just another "Christian denomination" but research on their beliefs and mission statement with careful comparison to Scripture would say otherwise.
My greater concern are the sheep with poorer-eyesight that they need to be more Biblically focused than they are. If they don't really study the Bible that well, it's easy to support a false minister without knowing that the person is an agent of Satan. It's my sincere hope that pastors just don't attack wolves in sheep's clothing but also make sure that their flock are Biblically fed.