Is this a trick question? You're asking a guy who sells upgrades for the MPC whether or not you should upgrade your MPC. My head is asploding !!!
Only you can answer that question. Do you save and load from your floppy or just boot from it? If you only boot from it, it might be cheaper for you to find another one (although I don't know what they cost). If you plan to do all your saving/loading and booting from a new drive, then it might make sense for you to upgrade to a better, more reliable storage medium that has the ability to do all those things.