Depends on whether time travel is going to undo a whole lot of stuff in short order, and whether that’s exactly what Doc figured was going to happen. If both of those are so, and I think they are, then — what?
Still sounds really difficult.
To be clear, this is what I think of when I hear, "beat Thanos easily. I’ve got no doubt that Thanos is going to be beaten in the next movie, and Dr. Strange is going to be a key part of that, but it’s by no means going to be an easy victory. Because that would make a boring movie.