If they build up The Fiend vs Roman all the way to Mania as a long-term storyline I'm okay with it. If they bring Roman back and have him take the title within a month or two from The Fiend, I'll be furious.
Fiend vs Roman is super ballsy though considering Roman's history of being booed as a face and Fiend's hyper-popularity despite being a heel.
I haven't watched yet but judging from this thread Roman beats down Fiend post-match? If so, I'd have much preferred Roman coming into the ring and them going face to face and before Roman attacks, Fiend does his magical disappearing act. Fiend doens't have to actually sell a Roman beat down but still comes across looking scared/heelish.
Roman can still have his post-match moment that WWE so desperately would have wanted for him.