Right. An attempt to do a full rewrite just doesn't pass the most basic cost/benefit analysis.
Redoing it in [sexy language / framework / paradigm / design pattern] will feel aesthetic, but even if it goes perfectly, it won't get you to $40M a year.
But if it goes poorly, it might get you to $0M a year (and fired).
The bigger question for OP should be "do I wish to be employed by an organization that is OK with these engineering practices?" Nobody can change culture by themselves, and certainly not just by introducing a sexier technology.
Redoing it in [sexy language / framework / paradigm / design pattern] will feel aesthetic, but even if it goes perfectly, it won't get you to $40M a year.
But if it goes poorly, it might get you to $0M a year (and fired).
The bigger question for OP should be "do I wish to be employed by an organization that is OK with these engineering practices?" Nobody can change culture by themselves, and certainly not just by introducing a sexier technology.