I imagine 2 things can happen. 1. Community goes on a full on outrage. 2. Someone (maybe even a competent mojang employee) is able to continue supporting the Java version.
DLC? They already have Minecraft: Crossplay Edition for that kind of stuff. If they decided to discontinue the Java version, it will probably take a big hit and even hate from the community.
It would also considered as a big loss to the creative mode community of the Java version (where plugin such as VoxelSniper and WE resides)
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