People prefer plastic money because it's fast, easy and hastle free. All though plastic money is rapidly inreasing, paper money will not be replaced by it. Credit and debit cards are too "unstable". It will always have its faults. With paper money you always know what you have.
I don't think plastic will just replace paper it will take a long time to get the paper money back into one area. Plus you have your money collectors to. Although plastic money won't tare as easily