Well I bought her the day she came out, really liked her, played her for a bit but never really quite "got her" at the time. Now I picked her up again maybe a month or so ago and this time round I've got a much better grasp of what she's about. And she is THE MOST FUN I've had with a character since picking up Shang Tsung. Yeah she can be hard to use online, lag screws the timing on some of your cancels and your aa's, but I am still having a blast playing her.
That said, I don't think there will be much of a Skarlet bandwaggon. Everyone knows how much of a beast Kabal is but I don't think there was ever a Kabal bandwaggon, just a few extra people who went "Wow REO's Kabal is sick, I want to do that", few people got it together, the rest just quickly failed and gave up. Guess that's techincally a small bandwaggon, but iduno...
She's a difficult character to use (in the grand scheme of MK9, but frankly that doesn't say much now does it really
, but why would the masses use someone who's more difficult to use than other good characters), other "bandwaggon" characters so far like Cage at least have easy basics that people can get straight into.