Any reasonable person would have already been concerned about Trump's policies (especially foreign policies). If you paid attention during the election and didn't bat an eye when he endorsed the use of torture or said that we need to "take out the families" of suspected terrorists, and if you didn't think it was concerning when over 100 military leaders denounced Trump as president, then I doubt the CIA director condemning his policies will affect your opinion at all. Even when all of these warning signs come true, and Trump's presidency is a disaster, these people will probably somehow find a way to blame Obama and Hillary Clinton.
Yes, the CIA director's condemnation of Trump's foreign policies is cause for concern-again. It seems nearly everything Trump says and does is cause for concern. He repeatedly makes decisions that seem to fly in the face of reason and good judgement, while intelligent, experienced people like the CIA director point out the problems with his actions.
Trump's foreign policies are not a cause for concern any more than Obama's are and will be. The reality is that the CIA director is merely looking out for his own hind side. He is more interested in what is good for him, as opposed what is overall good. Follow the money.
There are many people in the political establishment that don't like Donald Trump. This is a good thing. That he doesn't like Trump's policies is probably a sign that Trump's foreign policies are going to shake the boat. American is not going to go on an apology tour under Trump like it did under Obama.