Nvidia's monopoly is pretty much detached from price at this point. That's the entire reason
why they can charge insane margins - nobody cares! There is not a single business squaring Nvidia up with serious intent to take down CUDA. It's been this way for nearly two decades at this point, with not a single spark of hope to show for it.
In the case of ARM, Office, Linux, Huawei, and ChromeOS, these were all actual alternatives to the incumbent tools people were familiar with. You can directly compare Office and Lotus because they are fundamentally similar products - ARM had a real chance against x86 because wasn't a complex ISA to unseat. Nvidia is not analogous to these businesses because they occupy a league of their own as the provider of CUDA. It's not exaggeration to say that they have completely seceded from the market of GPUs and can sustain themselves on demand from crypto miners and AI pundits alone.
AMD, Intel and even Apple have bigger things to worry about than hitting an arbitrary price point, if they want Nvidia in their crosshairs. All of them have already solved the "sell consumer tech at attractive prices" problem but not the "make it complex, standardize it and scale it up" problem.