That's a very naive viewpoint - if you present your boss with the reality of the situation, that you put off completing the project to rewrite code you've already written because you weren't happy with the results and have some vague idea that some future programmer might struggle to read it, s/he's going to look for someone who can deliver.

While you and I know that refactoring is the right thing to do, the customer/manager isn't going to say "by all means, delay completion of the project in pursuit of improvements to parts of the system that only you have to deal with". They don't see/understand the code so naturally they don't care about its state.

[note] Obviously this is a blanket statement but it's been applicable to me and I'm sure others have experienced similar.