Given all of the new investors, how many of them will stay and how severely will demand be impacted with the next seriously negative market event?
The increment in volume can be the consequence of increased daytrading activity. Once the price started shooting a lot of volatility was introduced in the system, which allowed daytrading. Many arbitrage opportunities also opened up, which probably moved the volume up as well.
Yes, it seems like bitcoin is catching up some speed, but I don't think that this sudden spike in price is demand driven.
In Hong Kong, they gamble more money on horse racing in a single day, than the UK does in a whole year.
In Macau, single card draw is popular, for an instant adrenaline rush, nobody wants to sit around a poker table all day to win what you can win in a few minutes.
Bitcoin is no different.
How many people buying bitcoins are investors and how many people are just trying to buy something with a transaction that can't be traced back to them? That's a big draw to Bitcoin right now.
To investors, the price you pay matters. To people just trying to buy goods and services with it, it doesn't matter if Bitcoin is at $50, $100, $2000 or $20000.