Final answer:
No, the Dependency Inversion Principle should not be ignored even if a class is unlikely to be modified, as it promotes more maintainable and flexible software design.
Step-by-step explanation:
If a class is unlikely to be modified, it does not mean that the Dependency Inversion Principle should be ignored. The Dependency Inversion Principle is a key aspect of solid software design that promotes a decoupling between high level and low level modules, making the overall system more maintainable and flexible, even if a class does not currently seem like it will change. It's a proactive approach to software development, ensuring that if changes are needed in the future, the system is structured in such a way that those changes can be made with minimal impact.