Even if you have an incompatible codebase that you don't wish to convert, you'll be able to set `RUBYOPT="--disable-frozen-string-literal"` so it keeps running.

Even if you have an incompatible codebase that you don't wish to convert, you'll be able to set `RUBYOPT="--disable-frozen-string-literal"` so it keeps running. And since that flag really doesn't require lots of work in the VM, it's likely to be kept around pretty much forever.