R.I.P. GOMU GOMU NO.
After reading the spoilers, and thereafter the comments I have mixed feelings.
On one hand, the very reason we fell in love with Luffy is that his greatest strength was his character and his will, which made his "mediocre" devil fruit appear even stronger. The entirety of One Piece is based on "if you want it bad enough, you'll get it". Redesigning the entirety of Luffy's powers by revealing that all along he had a different Devil Fruit (and a Mythical Zoan at that) which (as signs suggest) is probably overpowered is in contrast with the concept. Luffy winning fights as a paramecia rubber fruit user is much more enjoyable than him going Goku mode. So the phrase "Gomu Gomu No" we have so strongly associated with Luffy is wrong?
On the other hand, it might be too soon to judge anything but for now, I stand with the first part of my comment.