Yes the last two weeks of growth was unsustainable and now we've seen a correction. To say that BTC is going down to sub-dollar levels is foolish.
A correction like this is usually an over reaction, just as the rise was. We're seeing lots of support at $70 - $80 so I think that is the low side and we'll be back around $100 by the end of next week.
I really don't think we'll see BTC below $50 because of this. The worst is behind us and we're still on track for massive growth this year. This is a buying opportunity.