Of course the rapid fall has made me think about Bitcoin's chances. But without going into details, I don't think much anything has changed except the price.

When you think about buying or selling, then you should look at the price. And buy when it is low, sell when it is high.

When you think about the viability of a technology, you should look at the news, and since they typically provide a very distorted picture, go behind them, the fundamentals. If the fundamentals are good, you should seek to buy when the price is also low. If they are bad, you should seek to sell, especially if price is high.

Seems that there are enough people in the market now that think the complete opposite of what I do currently, concerning the relation of price and fundamentals