Could speculation some day rise bitcoin to the moon? I saw too many questions about bitcoin losing value.

But in my view, 21 million bitcoins is relatively less money (ie., units) than other currencies. Why wouldn't Bitcoin's value rise simply due to supply/demand when it is used more widely?
Because there is no guarantee that bitcoin will be in demand in the future.  Here's an example, in a recent Gawker article they put "(RIP)" when naming Bitcoin .. as if it had died. http://www.gizmodo.com.au/2011/09/is-digital-money-the-new-way-to-buy-drugs

Of course, the existing $35 million or so valuation of the currency come from those speculating that the value of the currency will at some point in the future buy more than it will today.

Whether or not this will be a stratospheric rise nobody knows but it isn't unprecedented, just not typical nor expected by most.  But there are those, such as Rick Falvinge, who believe it.  Rick describes his thoughts here:


http://falkvinge.net/2011/06/16/bitcoins-four-drivers-part-one-unlawful-trade
http://falkvinge.net/2011/06/18/bitcoins-four-drivers-part-two-international-trade
http://falkvinge.net/2011/07/03/bitcoins-four-drivers-part-3-merchant-trade
http://falkvinge.net/2011/07/05/bitcoins-four-drivers-part-4-investment