DISPATCHER FEELS A319 FLT CREW FAILS TO GIVE REASONABLE CONSIDERATION TO HIS SUGGESTION FOR A RERTE AROUND WX.

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AT TOP OF CLB OUT OF SMF; I ADVISED CREW OF SUGGESTED NEW ROUTING S OF 2 LARGE CELLS OF WX OVER NEBRASKA AND THE OTHER OVER IOWA. CONSIDERING THE WX WAS MOVING N AND ACROSS THE RTE FILED; I THOUGHT THE MORE SOUTHERLY RTE WAS SAFER AND AVOID THE 2 AREAS OF ENCROACHING TSTMS. I SENT 3 MESSAGES TO THE CREW WITHOUT RESPONSE TO ANY. MY LAST MESSAGE TO THEM WAS 'PLEASE ACKNOWLEDGE THIS MESSAGE AND/OR PREVIOUS MESSAGES.' AFTER SOME TIME WENT BY; I STARTED A CALL TO ZDV TO MAKE CONTACT WITH THE FLT. AS THE SUPVR ZDV ANSWERED; I RECEIVED AN ACARS FROM THE FLT STATING THEY WOULD CONTINUE ON FILED COURSE AND ASSESS THE WX VISUALLY AND THEN MAKE ANY NECESSARY TURNS. THIS WAS CONTRARY TO WHAT I WANTED HIM TO DO. I THOUGHT THE SAFER PLAN WAS TO FLY S OF THE WX BUT HE SEEMED AS IF HE WAS DETERMINED TO IGNORE ANY REQUEST OR SUGGESTION THAT I OFFERED REGARDLESS. HE WAS OBTAINING ALL HIS INFO FROM ATC. I WAS EFFECTIVELY OUT OF OPERATIONAL CTL OF THIS FLT. THE CAPT HAD ABSOLUTELY NO REGARD OR CONCERN FOR MY RESPONSIBILITY OR INPUT. AS I TYPE THIS; HE IS HEADING DIRECTLY FOR A LINE OF TSTMS THAT COULD HAVE BEEN COMPLETELY AVOIDED HAD HE NOT BEEN WEARING HIS 'I AM GOD HAT.' THIS HAS PUT ME IN A VERY UNCOMFORTABLE SITUATION. THE CAPT HAS TO COME TO REALIZE THE SCOPE OF THE PICTURE THAT WE HAVE IN REGARDS TO THE WX AHEAD OF THEM IN DOWNLINE CTRS.