I think it’s, to say the least, a far stretch that state sanctioned murder of Christians will occur in the US in the near future. Possible? Sure, I guess. Likely? I doubt it. General support for religion in this country is still high, relatively speaking, and our legal system is strong and stable enough to prevent these kinds of things from happening.
We currently have a president who claims to support religious freedom, and many voted for him for that very reason. Our bipartisan political system is so deadlocked at this point that it would be hard for one extreme ideology to take over, in my view.
I do, however, foresee greater restrictions and antipathy towards traditional Christian ideas as our society begins to embrace philosophies and lifestyles which contradict the Gospel. This can be seen especially on college campuses and in certain political forums where opponents of Christianity are often not shy about their efforts to dismiss and stifle ideas that aren’t congruent with their own secular worldview. We’re seeing this now in the universities where professors who try to have intelligent debates about these things are automatically labeled “bigots” and certain vocal groups of students go after their jobs.