yes, you are 100% right, one day, all the coke will be free to live its own life.
I agree with your principal of not letting other people get to you, but seriously, I don't think you could have used a worse analogy to compare it to. People who don't spend the money for a new cup are not fighting any inherent evil, if they were, they wouldn't be giving disney all the money for the tickets, hotel, etc... And even in the future, hundreds of years from now there will be no books telling stories of how people took soda to fight the all powerful disney machine.