I've always found the Twister attraction to be a little lame. For one thing, the subtitle "Ride It Out" is quite misleading, as there is no "ride." You stand and experience a simulated storm.
While I enjoy the kind of hokey preshow where Bill Paxton and Helen Hunt wax philosophical about Twister the movie and how "real" it was, the attraction itself is really nothing special.
If Universal really wants to take out an attraction, I think Twister makes for a much better candidate than the rumored Kong removal. Kong is classic -- Twister is just a "now" movie, whose "now" time has been over for a while.