Re: Well, gee, what do you know?! Worf was right!
Problem is in "Yesterday's Enterprise" they KNEW they were in a loop because each time through events grew different as they grew more and more aware of what was happening. It's also a matter of "what do we have to lose?" So if they change course that might be what gets them in the loop. So what?! You're in the loop anyway so either you'll do what you're "expected" to do or you'll get out of the thing that has you trapped.
For me, and for many of us, the future is now in the past.