In any context like this, it will depend on the specific facts of the case. The court would look at what you are trying to accomplish, at the status quo and at the minimum requirement to establish that.
It's difficult to comment on a hypothetical. I could imagine arguments being made that there's a natural equipment life cycle, and setting the requirements for the next generation of equipment and letting them life-cycle out could be another argument. That is an argument, in theory, that could be made, but it would have to be grounded in the facts and specifics of the case.