> inflation is an absolutely necessary force in an economy
I don't think there is good evidence of this "fact". Economics is not a hard science.
A few points, one, you can't argue that bitcoin deflates and therefore is worthless. The is an obvious inconsistency there. Second, imagine if bitcoin had built-in inflation. What would happen if someone would release bitcoin+ with inflation equal to zero (i.e. current bitcoin)? Obviously the "good money" would drive out the bad and everyone would save bitcoin+.
It's not related to your comment, but I'd also like to comment on the Ponzi scheme arguments. My question is, how would you design a cypto-currency to avoid to problem of early adopters getting wealthy (the new ripple has a different scheme, a terrible one, IMHO)? You have to introduce the currency somehow. If you are an early adopter of bitcoin, should you sell now at $100? Maybe you should have sold out when it got to $1.