It is unfair of jnbiche to close discussion by simply saying sour grape, but you seem to be too determined - maybe even evangelical looking at your nick - perhaps its something to do with leftist ideology?
In any event, the article raises two points.
1 - the currency is deflationary.
I'd argue that it is an inherently stable currency no different than gold. Many economists may say that a hard currency is not a good basis for an economy, but many economists say it is. That includes Hayek who won a Nobel for his theory of how best to allocate resources.
So to say that bitcoin will fail because it is deflationary is at best an opinion. You're free to hold it but that hardly makes bitcoins a scam.
2. Something better may come along.
That is basically saying bitcoins may fail, therefore it is a scam. In that case, most of the companies YC funds are a scam. They too disproportionately reward the founder and the first employees. You may say but they create a hard product of value or offer a service. Firstly, I'd say bitcoins is a product. It is not tangible, it is only 0s and 1s, but it is a product created out of applied mathematical theories and formulas and computational power. I'd also say it is a service for obvious reasons.
Even assuming you disagree with the latter points, lets go back to the YC funded company. Lets say they create something like google - a service - facebook - a service - wordpress - a product. Lots of people invest in these - making the founder and first employees rich beyond means - then something better comes along. Are you suggesting google is a scam? Oh but google has value. Say who? It provides a service - so does bitcoin.