That has been the main problem from my point of view, too much pivoting looking for the right crowd, without finalizing what was done before.

And while some features in other languages might have seen an implementation first in D, claiming first to the finish line as it usually comes up, even on this thread, hardly does anything for language adoption.

On the contrary, it is one reason less leave those languages, as eventually they get the features, and already have the ecosystem.

If you don't mind waiting 10 years, sure!