D is a mess, Rust maybe no, but seeing how firefix is lossing browser share, I doubt in 5 - 10 years, there will be any company behind it anymore, same for kotlin, with vscode beating jetbrains.
D doesn't bring anything new to the table, that's why it's not as relevant.
To draw a parallel with Java, eventhough Oracle is ruling the project with an iron fist the FLOSS implementations ensure that developers won't find themselves SOL if Oracle decides to pull the trigger and kill their Java business.
Hmmmm ~ can you elaborate on why you think that this is the case?