Quoted from Captain_Kirk:Ghostbusters will outsell Metallica, that's for sure.
I'm going to disagree. This is a home owners market. Playability has a lot to with how many machines will sell. GB has the hype now, but is it going to stick? Time will tell. For now MET is still selling, and has a large amount of people purchasing the machine who have no interest in the band.
To stay on topic, I don't think GB will reach that 10k mark.