I loved ROTR but personally don't think any of the songs would have been that successful as singles. Of course, it depends on how we define success! But in terms of radio play, the production of the songs just didn't fit with the popular music at the time. In 2011 people were more interested in upbeat dance-pop like Katy Perry's "Firework," P!nk's "Raise Your Glass," and Lady Gaga's "Born This Way." If the album had been released a few years later, "Bride" or "Dear California" might have found a home on the radio next to Lorde's "Team," Christina Aguilera's "Say Something," and similar toned-down songs.
I'll be really interested to see how "Operator" does if that's the official single and gets sent to radio and a good MV. I don't follow American music that much anymore so I can't even guess. Hopefully she'll get on some late-night shows like she did during ROTR.