Miley will be selling over 400k this week with Wrecking Ball, as Billboard reported earlier today on an article about it possibly becoming Miley's first #1, adding that streaming is playing a significant part on this climb. (
http://www.billboard.com/articles/ne...-wrecking-ball)
If she's selling top of 400k, I believe The Queen will not have it so hard next week, I'm confident she'll burst that front-loading, she has always done (Gimme More, Womanizer, 3, Hold It Against Me...)
I wouldn't be surprised if she comes close to Roar first-week numbers or even surpass it, I believe Taylor's record is kind out of reach, but I wouldn't doubt The Queen's power, as her lead singles have always taken home the records.