On the long run, it all depends on syntax stability which is tightly coupled with its complexity.

The "benchmark" to run to evaluate syntax complexity toxicity, for a compiled language, is how long an alternative compiler written by a small teams of averagely skilled devs, or even one individual averagely skilled dev, can stay a "real life" "working" alternative.

Mid-term/long-term planned obsolescence of computer language syntax is really...

Oh, and in my previous post: for compile time constants we can use static consts, my bad.