Speaking during an interview with Eurogamer, Ray Parker Jr. - the genius behind the "theme song" to the 1984 movie - says that's exactly what his people are looking into. Asked whether he'd like to see the song included in either Guitar Hero and/or Rock Band, Parker Jr. replied:
We were just talking about that, we're working on it now. I think they should have Ghostbusters in Rock Band.
Being a short, slightly confusing response, don't take it too literally. We're sure, with the money that's going to be flying around this game, he means Guitar Hero as well (forget Activision's Ghostbusters "dumping"...it's Activision & money we're talking about here). And that "we're working on it" doesn't mean "we hope we can sort this out". It probably means "how much money can we make off this?"
Eurogamer meets Ray Parker Jr. [Eurogamer]