I model much more conservatively than most here. Like that James Douma rough outline posted above, my modeling has about HALF the revenues and profits he is predicting, I think he's being too optimistic, but even at half the profits are staggering. And honestly I'm probably modeling too pessimistic, as I often tend to do.
With regards to someone else doing Robotaxis better than Tesla, there is one key differentiator for this new market that will be TaaS (Transportation As A Service), and that is FSD. No one else has anything even close to autonomy like Tesla does right now. The driving data is very important, if you combine ALL the driving data from other businesses trying to copy Tesla FSD, even combined they only have a fraction of the data Tesla does. More importantly they currently have no means or plan to bridge that data gap. Tesla's lead on autonomy is an enormous moat built over many years that can not be attacked anytime soon, and the size of the Tesla car fleet is the foundation of that moat. Without that fleet it's nigh impossible to challenge Tesla FSD.
With humanoids, which are much easier to do than Robotaxis, I agree Tesla will have lots of viable competition. The humanoid market will still be large enough to allow anyone with a good one to flourish, so Tesla will still do extremely well with Optimus. However, with Robotaxis, there is no pending viable competition for Tesla, it simply doesn't exist nor is it anywhere close to existing. Once Tesla solves FSD they will own this new Robotaxi market for a very long time to come, and the only way anyone else will be able to compete soon is to build their own FSD compatible EV's and license Tesla FSD. There won't be another option.
Game over man, game over!