200k wouldn't be bad for P!nk. That would be her biggest opening sales, I think. Or at least it would be a bigger opener than her last album.
Her last album Funhouse debuted with 180k so yeah 200k would definitely be an improvement. I don't think she'll top M!ssundaztood's debut of 220k though, unless the next single is a smash.
I don' think that Pink's prediction is largely overestimated. Funhouse debuted with 180k in 2008. True, So What was a big hit, but now she's coming off of a huge album era, as Funhouse ended up selling 2 million copies + her Greatest Hits did wonders.
This era also has a good start. She has an airplay hit on her hands, she did some interviews for high profile magazines and most importantly she has good promo lined up, including the VMAs. She has all preconditions to do 200k.