I forget who this commonly used quote is taken from, but I find it useful when discussing potential future technologies with people. "If a celebrated scientist says something is possible he [unfortunately the quote does use only 'he'] is almost certainly right. If he says something is impossible, he is almost certainly wrong."

I, as a lowly college student, would hesitate to call almost anything impossible. Speaking with the benefit of reading lots of dead smart people saying how impossible things that are trivial to us now are, I feel comfortable saying that future technology will likely surprise a lot of us. How surprised we'll be, however, depends on how much we underestimate ourselves and how much we constrain our imaginations.