My point: Bitcoin is rather subject to speculation than being anything else -- speculation in the possibility that it can be a major money transfer system in the future trusted by millions of people, in which case your hoarded BTCs will sky-rocket. That is the only value bitcoin is built upon right now (apart from the nerdy fun of the whole concept). The question is: how can it become a major money transfer system, or in other words: a currency? If it fails in doing so, your coins are lost (on the long run -- but defenitely before you are dead). I was going to point out that it lacks a mechanism that supports sane inflation.
Let me ask back: Looking at any well working currency system on the world, why is it that it's seems not possible to afford not to imply a decent inflation rate?
To help you understand: What would you do, if you knew, 10% of the bitcoins in your wallet would vanish each year and you are not able to use rate changes to speculate & compensate because the rates are stable? You would rather spend your bitcoins than seeing it vaporize, wouldn't you? Maybe in operations to get more bitcoins back than you have spent. So only your spending and working with the money avoids the economy from depression, because you create use value, so wealth in the society is maintained. Of course, it's better to increase the overall amount of money (thus equalizing the difference between hoarders and exchangers) rather than to take away money from hoarders. Inflation is an incentive to work, not to hoard. And work holds society together. Get the picture?
There are certain benefits to inflation, no doubt. However, BTC was designed the way it was designed, namely, to only have limited amount of it, period. That's one of the things that some people value about it (and others don't). Having the properties that it has (decentralization, limited amount, relative anonymity, etc) it's become an asset class of its own. Some people value real estate, some value dollars, some value euros, some gold, etc. Some like the properties of bitcoin. I am willing to bet that the majority of people like all of them combined, hence, these asset classes can and do co-exist. No one is stopping anyone else from creating an inflating, decentralized coin, let's call it IDCoin.
I imagine IDCoin and Bitcoin would complement one another quite nicely, as long as they are both decentralized I'm OK with both.