No. We aren't even close. There are term limits as well as the Constitution protecting us. There are sandals and inappropriate events that occur under every president's term(s). I would worry when the first and second amendment are gone as well as no term limits for presidents. So I don't see this happening anytime soon.
no,the U.S. is not turning into a dictatorship. very often radical changes in government can happen with astonishing speed,usually before that there are some signals that a nation is on the edge.although we've seen an erosion of protections against the invasivness of government and policing bodies try not to over react before you have what you feel is a sense of the full picture. Americans still have the ideals they've always had. because of changes in how the media can access information we may get a peek behind the curtain of power more often than in the past. that,and it being customary for people to see the time they are in less clearly than other times can seem to make the picture more bleak than it is. One of the great things about the U.S. is our education system. because of this we have an entrenched understanding that all power comes from the people.No official has any power that isn't given by us.And what we give,we can take back. So,no we're not in danger of dictatorship.
Don't hyperventilate. If an agency abuses power, overspends, or acts badly, that's correctable. A President who abuses secrecy laws and carries out illegal searches (it's been done, at least one time the FISA court has written scathing opinions of actions the Feds have done) is a prelude to autocracy, but because of the constitution and the fidelity of the military to it, there is no chance that a president could become a dictator. I so note that Obama has been crafting a general leadership of military leaders who are good with political views; he seems to have found willing leaders for his gay agenda, which was forced on the military without their agreement, resulting in increased sexual abuse (of the 26,000 sexual assaults, 14000 of them are male-on-male). This changes every 2-4 years as America has the chance to adjust and change course. As long as we have the vote, and a free press, a dictatorship is almost impossible.
A lot depends on how much a leader's circle (& their military) is willing to do to protect him/her & the bad policies they implement. The more cooperation a leader gathers, the higher the chances for power abuses. It's usually, but not always, an incremental overtaking. Individual or party power gained in small bits & pieces. Any generation that blindly accepts or dismisses questionable changes & policies, at the hands of excessively controlling gov'ts, risks putting them & their children closer to eventually losing fundamental freedoms & rights. History has shown this again & again.