This is the key argument for people promoting Bitcoin: Look how where we were a few months ago and look where we are now. It is only going faster - you should join.
This means that these people have jumped out of an airplane with no parachute.
They are now halfway down and are telling their friends: Look how well this is working, and it is going faster and faster.
When you tell the people they are going to crash-land, they just tell you it is FUD and that in their experience things have been going great since they jumped out of the airplane.
For me BTC it is not a pyramid. It is main currency of new currency type that will be used in the nearest future. Yeah, at present we see a lot of speculations and it is normal. I suppose all people remember events with gold 150 years ago..
It was expected about bitcoin everyone knows that bitcoin will move very fast bitcoin is not alone now bitcoin have now a lot of countries in its support and not only countries but also some rich companies and banks are also going to accept bitcoin and more companies and countries are joining bitcoin because world realized that there is only one digital currency in market which can help them in their economy so thats whys its moving very fast.