I posted a suggestion on the board, but figured I'd toss in here:
1. Jam chart or new team determines the list of "canonical" shows. Remove rating capabilities from these shows and create a prominent page with this list. Even create a project and select volunteers to write long form articles explaining the importance and excellence of said show. You get to remove them from controversy and also achieve the primary purpose you mentioned, making sure people are aware of these particular shows. I'd prob choose a word other than canon TBH. Sounds a bit too serious for my liking.
2. New "notable shows" page for 3.0 and beyond managed annually by jam chart or new team. Again you achieve the primary objective of helping fans find shows they should hear. At any point if a show like 12/31/23 comes along you can pretty much immediately add it to canon page.

You can still have the top rated page, but maybe divide into three pages by era? Or keep it the same and add some protections, but with the two changes above less harm can be done and also less incentive to commit the harm.

Someone else suggested potentially reaching out to RateYourMusic and considering implementing something similar to what they have: RateYourMusic FAQ

Hope this helps.