Are we ever going to stop using pennies?

Pennies are worthless. I hate getting them as change. They take up space in my change purse and make me think I have enough nickels, dimes, and quarters to buy coffee from the coffee machine. (The coffee machine, like most vending machines, does not accept pennies!) Does anyone really want/need pennies? They don’t have nearly the value they used to – a nickel now is worth less than what a penny used to be worth. So why continue to use them? Can’t we just round everything to .05?