Both.
Yeah, I think they should extend the rotation a bit, but they absolutely need to try to win.
Frankly, they should beat this team with a couple starters sitting, but with likely 3 days off before the playoffs start, I am not sure sitting guys down completely will do a ton of good. But, getting guys like Green and West more minutes, and Pierce, Allen, KG, and Rondo less minutes would be beneficial.
But they should still be trying to win, since the home court race is not over yet.