+458748573486533928
Though this has happened to me a very few amount of times, I can see how frustrating it must be to have a team member like that. However, I'm pretty sure that making it unbreakable will come with some bad effects so if the enchanting tables do become unbreakable, I would suggest having very few enchanting tables around the map that are breakable and then have a special enchanting table at mid that can't broken but you can still carry an enchanting table by finding it somewhere else that's not right at someone's grasp. This will allow for easy enchanting and possibly involving team-work depending on who finds a rare and loose enchanting table. My thoughts though, but yes, I agree with the suggestion.
(Very good idea by the way :))