It also leaves OpenAI vulnerable to any GPU breakthroughs. You could imagine company X comes up with a XPU that is 100% faster than what's currently there.*
We are still in the short-half-life phase of GPUs. If a 2x faster GPU is on the horizon, why wouldn't OpenAI already be in line to buy? They aren't buying just 1, they are buying multiple datacenters' worth. So they wouldn't be a low priority, back of the line customer.
A short half-life means you are going to quickly dispose of what you have now, anyway. In fact most current datacenters can't even handle Vera Rubin, so I don't think there's short term risk here.
Nvidia has probably monopolized several upstream supplies to manufacture critical chip components for next 2 years, the HBMs and Optics component from LITE, as well as TSM capacity. Let alone those power components they funded themselves.
Let's say you have a genius design, but you will have it close to impossible to compete with Nvidia in getting it to volumes.
Jensen is a player, he isn't fooling around with all these Asian trips just to wine and dine
nVidia can only 'monopolize' these components for itself inasmuch as other industry players are not seriously interested in them. This can change rather quickly.
* NVidia GPU, Google TPU, Apple SoC, etc.