It's kind of obvious that Roman is winning and going to Wrestlemania. For years they have had the idea of making Brock unstoppable and having Roman Reigns to beat him to become "the top star" and even since before WM 33 was done, they planned on that match for WM 34. Am I excited? Maybe not as much as some others.
But for me, I feel as though Seth Rollins is the more well-rounded performer and I think this past week on Raw he really pushed himself to a great performance. He has proved he can work both sides of the spectrum for Babyface and heel (although they didn't turn him soon enough, but this past week he really showed his babyface fire) and his matches have been consistently good for a long time. You complained about his title run, but the issue with his run was they went overboard with the "chicken-shit heel" motif in that he rarely had a clean win on PPV, and on weekly TV he was booked 50/50.
So to conclude, while I would not mind Seth Rollins being added, I've basically come to grips that it will be Roman Reigns vs Brock Lesnar. Will I love it? Idk