I respectfully disagree, we will not ever see 100 USD again, that is if we ever see it fall below - that would be the end of crypto. But this will not happen in a thousand years.
I do not know whether the price will go below 100$, but it is not impossible.
The current price is basically the result of three major surges in demand:
(1) Jan-Apr 2013 (that increased the price by about +125$, from ~15$ to ~140);
(2) Oct-Nov 2013 (increased by about +660$, from ~140$ to ~800$), and
(3) June 2014 (about +150$, from ~450$ to ~650$).
The first two events left the price at ~800$ in Jan/2014. From Feb to May the price fell by about -350$; the most likely cause is partial loss of the demand that caused bubble 2, the only one that seems large enough to cause such a drop. That would explain also the continuing drop since Jun/2014 (by about -300$).
If bubble 2 (only) deflates completely, the price may fall to 275$. A partial deflation of the other two bubbles would be enough to take the price below 100$.
I suspect that bubble 1 is Chinese too, but in the special economic zones, and perhaps with a different demographics from bubble 2. I still don't have a clue about bubble 3, but I see signs that it may be deflating too.
These are mighty strange bubbles. They never fully deflate and keep blowing bigger and bigger!