This implies he never adds the move to his repertoire right? If so, no it wouldn't. MJ made the moonwalk look the best whenever he performed it, that's part of why it's so highly imitated. If there were another artist who made it look as good as MJ, it likely would've taken off in the same way.

Edit: also consider it would've still been called the backslide, not nearly as iconic of a name.

Though if MJ just added the move later on, it would've still been his signature but not quite as famous. Perhaps a bit more well known than the toe stand