If a park rename is happning, I feel it is to be more than just "Thorpe", such as "Thorpe Island" as has been mentioned or something else with more than just the word "Thorpe".
Otherwise it would be a bit like being renaming Alton Towers to just Alton, or Chessington World of Adeventures to just Chessington; both of which are general place names.
On a completley diffrent subject, I wonder when will the park get their next flat ride like Rush, Vortex, Samurai, Slammer (Defuct of course), etc... I tend to find flat rides more thrilling than coasters.