But if all of these large companies create a monopoly where they realize that if they start undercutting each other or innovating too extremely then long term if Nvidia's stock decreases in value by a huge margin, the whole market itself can get down

As an example: if google TPU (perfected?) itself to the point that it hurts nvidia sales (maybe mass production perhaps?) then all the companies stock price might decrease (in my opinion including google)

Honestly, I feel like there is going to happen something in the market which is gonna be very spooky soon regarding AI.

I feel like we are gonna drag this bubble really long and actually worsen all the pain which is gonna be caused by it long term.