They're already backing up around here. They're just now starting to though, but Carkoon is slowly gaining pegwarmer status, especially Bib Fortuna.
Of course, the case shipping right now seems to have all the repacks as 1 to a case too, so it's not surprising that they aren't sitting. And Fett just sells because he's Fett and he always seems to sell. He's all I need to get for the kids and I just can't find him.
I haven't seen R2, Vader, Chewbacca or Fett yet. Barada seems to sit a little bit, but since the new ones are packed heavier they're much more cmomon. I just saw Leia for the first time last night though... Han I saw for the first time earlier this week. Bib I've seen for I guess 2 or 3 weeks now, and in multiples. That figure just doesn't interest people overall, so I'm glad we got him and he's out of the way (or in the way on the pegs now, but "out of the way" on the resculpt list).
I think a lot of the 1 per cases moving is people trying to take an opportunity to make some $. Call me a scalper conspiracy theorist, but I think people "into that" know there's 1 pers and they're gobbling them up either in hopes of trading them for stuff they need (fine), or outright selling them to make a buck... The OTC was the same way, but as soon as any of the repacks was shipped in any kind of quantity, it sat. I remember Bespin Luke's galore at some WM's around here but they were scarce for a while. Once that island display arrived though, they sat and pegwarmed like they did in the Saga line.
Same with everything else from Snowtrooper to Imp Trooper to Madine/Lando/Han AT-St... The repacks just puttered out like everything else if they shipped heavily.