I would kind of argue that last thing the park needs in the Twister space is another 3D attraction. That's all the front of the park is going to have to offer (unless you count RRR, which I don't). I just think it's a shame that we're going to lose a unique experience (whatever you think of Twister's overall quality, there's nothing else like it in the park, and it helps create a balance of ride/show experiences) for an attraction that - at best - will be similar in its execution to several other attractions already in the park. Maybe it'll be a fun ride, but will it be better than the other simulator-ish rides like Despicable Me, Transformers, or Gringotts? Probably not, and therefore, I don't think its existence will be justified.
I'm all for C-ticket type experiences. I would just like them to be more unique and distinctive than this Fallon thing - sight unseen, of course, and based purely on speculation, I acknowledge - sounds like it will be.