They would have to change the way the soda is handled. As it is now, it's an automatic 'take & drink' action. You have no control over the soda can itself. And just where does the empty can go ? Poof, into thin air.
I believe thay would make excellent weapons as well. Ever whacked someone by throwing a full can at them ? Or put it in a burlap bag and beat the crap outta someone ? You can crack skulls with them.