Jaws is my no.1 favourite movie amd my own personal view is that it should never be remade; as KalMart said, movies like this and Goodfellas, you just don't remake.
I get what the OP is saying when he/she says the book is so different from the movie that they should have a stab at making a movie that more closely sticks to the source material [so it's more of a reboot] but the thing is, JAWS is so ingrained in popular culture that people wouldnt see it as anything else than a remake that's had some scenes changed.
Now a straight up sequel that's approached properly [discounting [part IV]?
That's a different matter. The animatronic sharts in Deep Blue Sea showed me just how great a GWS could look nowadays, and that movie was, what, about 1998/9?