Too bad Nvidia is too expensive to get into the console market
nvidia's already in the mobile department, especially tablets and smartphones. On top of that, it has investments in the automotive industry. nVidia prefers innovation to stand out.
Actually Nvidia is not doing that well .. Tegra kinda failed .. manufacturers still prefer other chipsets.
The current market is quite strange, on PC Nvidia has an 80% marketshare, but if you add the 3 consoles in the gaming mix you`ll get AMD having almost all market share.
This could be a time just like 3DFX back in 2000 .. they were the best in their game but being stubborn and expensive made them loose everything and be bought by Nvidia .. Large companies can go down very fast, it`s been done many times over the years..