I've been a fan of Dali since I was a boy. You can't study him without owing a huge debt to Gala. Without her promotional efforts on behalf of his career he might have only been really discovered after his death.
I really believe that a thousand years from now people will still be admiring and debating Dali's art.
One more thing on Dali if you're ever in the Tampa area be sure to visit the Dali museum. I've been there four times and this winter I'm going to make it five!