Sentiments along the lines of: "For bitcoin to be adopted, it should be stable first" don't make sense, because adoption (demand) drives the instability. That statement is the equivalent of saying "For bitcoin to grow, it should not be growing."

That's right, and it's a feature, not a bug.

Those that do have wealth to protect should be encouraged to use it for productive investments. Mild inflation is one way to do that, and it is healthy. Massive inflation to fund overseas adventurism on the other hand, is not healthy.

As the author of this piece correctly points out, deflation leads to hording behavior. In a world where everyone used bitcoin, the wealth disparity would only grow faster.

Elasticity simply refers to whether the supply can react to price. In bitcoin's case, it cannot, since the supply is determined by an algorithm.