If they do continue the numbering, I'm curious if 8 will be the last numbered one because of a commercial for the... 2? 3? One of those, where it was a fake ad for the PS9. Of course, this all assumes Sony will still be around and capable of producing games. I have a feeling the road to even the 7th PS will be a rough one.
http://i207.photobucket.com/albums/bb179/EntityXIII/entityfn7.jpg