It's just become too expensive to develop a new language based on a novel model if you also want some serious usages since the expectation for a production leve

It's just become too expensive to develop a new language based on a novel model if you also want some serious usages since the expectation for a production level system has skyrocketed. We still have lots of new interesting languages in development (especially in academia) but those won't ever see wide adoption outside their own paper though.