lol!
Sadly I don't think we will be seeing any more companies entering the PC graphics market. Not ever.
There are a few left in mobile, but even then in practice it seems to be down to Qualcomm vs ARM and I expect them to stay firmly in mobile. That's largely why I don't understand people on some forums hoping for the death of AMD, how can they think life will be better once down to Intel vs Nvidia? Specially with the history between them, I wouldn't rate Nvidia's long term chance if they get Intel's focussed attention.
I suspect that is why Nvidia is raking in the money while they can, they could do with a war-chest for the times ahead if they can't get their ARM CPU to take off (which I really hope it does, it is one of the few really interesting designs of recent times).