The Zig creator is very conscious of this, talks a lot about rejecting many proposals and ideas to keep the language simple, not being an ass-hole about it, just to avoid what happened to C++.

Computer science is less than a century old. There's no reason to think we know enough to design perfect languages yet. But with an additional 30 years of hindsight, we can make somewhat better languages now, and we should.

There's absolutely no guarantee that these problems will be avoided in rust and zig; we only have the benefit of hindsight to avoid the problems we have now, and a recorded history of the kinds of things that tend to go wrong in committees (factions, infighting, BigCo interference, intrigue, egos, bike shedding, etc).