I can see where it would pull in a few folks that are married to semi auto guns more or less exclusively. A 9mm gun would allow them to have "A" revolver without a lot of extra effort to buy or reload a different ammo type.
But really? I think this would be a rather small group. After all, the sort of revolver that would appeal as a staunch semi auto type that is only interested in one revolver as a bit of variety would be more likely to be a flip out hand ejector SA/DA revolver. Most semi fans would not want to bother with the shucking and loading one at a time through the gate of a dedicated single action.