Adding 1.16 stuff to Bedrock is definitely a possibility. I agree that it would be really cool to see the newer blocks on maps, and be able to utilize newer items such as the crossbow, trident, and netherite in games. However, updating the entire server to be 1.16 compatible would be a substantial undertaking. From my understanding, much of the server would have to be completely remade or significantly altered.
I don't think that the new features 1.16 would bring would add all that much to players' experiences, especially considering the amount of work that would have to be put in. A content update like a new gamemode or the Spring RPG is most definitely a more effective way of making the server more engaging and fun. Updating the version is not a bad idea, but its not something that I can see happening in the near future.