How much does Vive/Oculus/PSVR need to sell for you to consider them succesful?

[MortienGerrux]

Don't expect the first generation of the Oculus/Vive to last longer then 2 years.

1200P is really low (let alone 1080P on the PSVR) so they will get replace by 1600p on the second gen and 2160P (4K) on the third gen.