The obvious reason for BC's attraction is that it shares the same properties as gold: limited supply, inoxydable, barely falsibiable (except for gold plating of tungsten ingots).
*PLUS*
In some respects, BC is even better than gold: zero weight, invisible, unseizable.
It can still be (slowly) mined at no cost, in winter as a byproduct of heating.
It is a tax haven, immune to government greed.
*BUT*
Unlike precious metals, BC is artificial: Science and technology will never create new precious metals, but Computer Science can create infinitely many clones of bitcoin, so that the claimed rarity is an illusion.
I expect the birth, within a few months, of some new BC look-alike, easier to mine, backed by some wealthy individual able to offer a large choice of goods and services: enough to start a real ecosystem, but of course, imitations will emerge to compete.
The original Bitcoins will then be forgotten, and by the way, so will be the dollar.
My two cents ...