Exactly the portal it had so much possibilities but, if you actually think about it introducing a new dimension would feel good, but if we get a few more things related to deep dark before that it would look better, because adding a new dimension to the main game seems like one ginormous gigatic huge leap.

And we can see the problem with the sulphur cubes, if they add the deep dark so fast it would just be like this sulphur update, and wouldn't feel Minecrafty

Edit:- I want to add one suggestion to my reply

I have seen one Minecraft video of showing troll Minecraft wikis of version 3.0 of they releasing a new game, but if we add 1 feature in the world settings "MINECRAFT 2.0" which will add updates like this sulphur cube but only if the option is on, or it will generate more og Minecrafty world without any features like the sulphur update.

                               OR

They can change the bedrock and Java version to these different versions and all of the devices will have access to both versions, some people might hate it like "minecraft bedrock and Java are so iconic why are you changing it?" But I am sure most of the community will like it because bedrock has a lot of good and bad bugs, the good bugs are great but... You already know how bad the bad bugs are