[WhitneyLand]

That's a proportional problem at least right? As months pass the more of your libraries converted to Rust the lesser the problem.

The potential party spoiler being third party code that's not practical to replace. In some cases even decades won't change it's nature, as a few examples have shown.

[cma]

At some mid point you would have maximum C glue code in place, and then things get better after that.