I am working on a code base where refactoring the code as the product grew was not even considered as most of the technical decisions somehow fell into the hand

I am working on a code base where refactoring the code as the product grew was not even considered as most of the technical decisions somehow fell into the hands of non-technical business people (for the last ten years). Just over a year ago the code base was handed over to a technical team (there used to just be one coder (never the same coder as they all seemed to hate the product and move on, now we know why)) to review, and fix to make it more scalable. Well to put it lightly it is a complete cluster fuck that has seen a couple people resign and it is not worth trying to fix. Now the burden has become trying to convince the business people that drastic steps need to be taken (ie full re-write). They don't seem to want to even entertain the idea, so not sure what is actually going to happen.