I don't think any company with multiple investors will accept Bitcoins as a payment option when they see the level of fluxuation in the BitCoin market.  You "pay" for a degree of stability with our current payment systems pegged to the dollar, but with BitCoins it would make things difficult in so many ways.

A grocery store, as an example, wouldn't need to update their prices on almost a daily basis.  That takes materials and wages to accomplish which is an expense most probably don't want to pay.

I don't think many of us would you want our paychecks to be paid in BitCoins.  If we could peg Bitcoins to oil prices and got gas stations to accept bitcoins, then we may have found a way to find stability in gas prices... but that sounds like science fiction to me.