I don't think he's against it and does believe in a future reunion, however, also made the statement that they are not Victor & Nikki. Per an interview with Today (June 2024):
❝ It’s been quite some time since Nick and Sharon have been together, yet some die-hard fans are always hoping for a reunion. Morrow certainly understands and reassures us that the pair will inevitably get back together one day.
However, he's quick to add that Nick and Sharon have a complicated history and have both "hurt each other deeply." Because of this, he doesn't foresee the couple sailing off into the sunset together one day. "They’re not Nikki and Victor," he says. ❞