Fixing bugs in poorly designed/written code is the number one cause of unhappiness for me. Maintaining my own code is fine, at least it is a learning process to see what worked/didn't work in the original design. Instead of letting everyone rewrite the legacy code with a new language/framework, I think the solution should be that each developer needs to maintain the code they write as much as possible. Maintenance work should be properly rewarded and project ownership should be promoted.