Not sure it's an actual fear but... It would be a disappointment if the game didn't reach it's potential.
I imagine if larian released great modding/DM/ story mode tools both modders and game developers could add all the campaigns (official and homebrew) into the game engine. It could also be used for testing builds, just doing random encounters etc. If your friends are away you could play your custom campaign together.
If larian /WoTC licensed the game engine and DnD developers could continue to add product. With good tools we could do a conversion to DnD 2024 rules set. If say the game ends at level 15 we could add more content for higher level play.
