Ok, so maybe "extremely" was a bit much. In my defense I think leaving is much simpler at this point than hoping that the current course of politics and public sentiment in the US will change.
> 1) Barriers to work and emigration
While real, they can be overcome. Also, I'd wager there will be something of a domino effect -- once other countries begin to catch on that well educated, highly trained Americans are looking to leave, it will likely become easier to do so.
> 2) Language barriers
One, you'd be amazed how much you can get across non-verbally. Two, it might take years to become conversational in a language, but probably only a handful of months to get good enough to do the daily shopping. Three...what everyone else has said: if you know English, there are very few places in the world where you'll ever be completely unable to communicate with someone.
> 3) A lot of us have family support systems that aren't easy to give up
Yeah, I understand completely ;-)...
My mother was born in the same house in Switzerland where my grandfather and his brothers and sisters grew up. My great-uncle lived in that same house until the day he died, and my great-aunts still live in the same village to this day. I can only imagine how hard it was for my grandfather and grandmother to give all that up and move their three children to America in the '50s, but they truly believed, at the time, that it was worth it.
At the same time, while I do have family where I live now, I also had to leave behind a large family in the US. Airline tickets are expensive, but manageable for at least once yearly visits. Video chat is all but ubiquitous. Time zones differences are the hardest to manage, but still doable (http://everytimezone.com/ helps, even though they still don't have my time zone).
I don't like that I now feel like I had to leave, though I am very glad that I did leave.
Living in another country, even if only temporarily, is something I would recommend to anyone in any country. A friend is currently living abroad for a year with his two school-age kids, and he seems to be having a blast so far. It will certainly improve your ability to gain perspective. It may change your outlook on life. Certainly, when I left I still harbored the notion that at some future time I might return...I don't feel that way any longer.