I don't believe there is a downfall. Most stocks, shares ... anything trade-able has it's up and down cycles. Bitcoin has been one of the very rare commodities, like the Dot Com thing earlier this century. It has climbed steadily with only small dips, now it has a large dip. Like other commodities, it now needs to settle on it's level.

I only spend a few dollars on BTC. Try to buy coin at the small troughs on the graph. If the price increases by 20% I sell some coin and then order more at a lower price. Have turned $100 into $205 over 7 weeks so far. Better than playing COD, or other online gaming.!