> contemporary web browsers are unlikely to be fully rewritten in any other language
Right.
> it is an unreasonably high bar
It's not an unreasonable standard. We're talking about replacement. If isn't replacing C++ for this use case, then it's not a replacement by definition.
It's unreasonable in the sense that LLVM and a few others may survive even after pretty much everything else got replaced. We need to exempt some outliers with a very high sunk cost.
Right.
> it is an unreasonably high bar
It's not an unreasonable standard. We're talking about replacement. If isn't replacing C++ for this use case, then it's not a replacement by definition.