Earlier quoted context omitted.
It's actually more complicated. With previous bubble spikes bitcoin price starts rising first then search term follows but search term then peaks before the price peaks.
I know everyone is going to say it is, but what if it's not a bubble... What if the huge demand and very limited supply is the driving factor behind the current price? I mean, even if you don't like bitcoin, there are a thousand more coins and there might be something in there for everyone... but you typically need to buy bitcoin first before you can get most of those coins.
It's rise in price is none-the-less astonishing, and is somewhat a testament to the soundness of the security model.
The whole system does require new money coming in all the time to maintain current price levels, as miners need to sell their bitcoin to get paid. It's less than a zero sum situation, as some of that money coming in goes directly to paying for the mining costs.
Since the overall awareness of Bitcoin is relatively low, in terms of actually knowing what it is, and how to get some, this bubble could run a long time, as there is a lot of money in the world, in need of investing.