My disneyland annual pass was revoked for underage drinking. I only have a payment left. Could I just buy a new pass?
Not if they have you recorded in their system.
I had a quick look through the T&C, the only phrase I found which covers this situation is this: "Disney reserves the right to cancel, suspend or revoke any Passport or deny Theme Park admission to any Passholder at any time for any reason. Cancellation, suspension or revocation of either Disneyland® or Walt Disney World® Passport privileges under the Disney Premier Passport will result in the cancellation, suspension or revocation of all privileges of such Disney Premier Passport." So they were within their rights to revoke your pass, but there is no stipulation which suggests that you'd be blacklisted. Rumours suggest that people HAVE been banned, as in banned-banned before, and prevented from entering the parks, but it doesn;t sound like you've received such a ban. They tell you in those cases, so you should be able to buy a new ticket.