While I can't say that I agree that the US needs to simply abolish the penny (how would odd change be made--anything not a multiple of 5?), if it actually costs the US 2 cents for every 1 cent minted, the comic book master has a point. It's problematic too. Perhaps instead of eliminating the penny, we mint it with a metal that equals its value? I know with the out of control debt-based currency the US has, we may not find a cheap enough material out of which the penny can be minted. Still, better that than making shopping math that much more confusing.
Have you ever noticed that little 9 next to the price of gas at a gas station? It's 9/10 of 1 penny automatically rounding your purchase by 1 cent. The same happens at the grocery store and with ever kind of merchandise conceivable. Consider that without the penny, gas prices will automatically be rounded up not by $.01 but by $.05 because there would be no way to collect the any amount not a multiple of 5. The elimination of the penny will create just such a mathematical dilemma.
So, find something more suitable, but do not get rid of the penny.