I feel like Minecraft surges in popularity pretty regularly. As long as people continue streaming it and posting videos of it I think that’ll remain the same. I don’t know if someone who is looking for a taste of what they saw online will know the limitations of Bedrock. They might just pick it up because it’s available on whatever platform they use.
I suppose killing Java might put a stop to the content that is being created with Minecraft and that might cause it lose its relevance but I don’t know if a majority of content creators are using Java or Bedrock.