Yes, merchants LOVE the idea of having to change the price of their merchandise every 10 minutes because of massive parabolic price fluctuations. Nothing is better than having to renegotiate with a customer over how the intial payment they sent now won't even cover the shipping to send the item out.
Bitcoin will stabilize. And this happens with any currency; it's why all the airlines are bankrupt.
No, airlines are bankrupt due to the belief that a finite resource (oil) will stay a low price forever despite the increase in it's consumption and the depletion of it's reserves, coupled with an increase in "low price" fares which don't even turn a profit.