I don't know how likely global dominance is for TSLA in the global automotive market but I'm not going to write it off as entirely impossible, zero chance, without a better reason than it's not common or I can't think of anyone else who has done a similar thing.
First principles.
Really it is simply considering the human attitudes and governmental attitudes towards monopolies and national champions.
The EU, most of the members, China, Japan, South Korea and the US will most certainly not allow their legacy automakers to disappear. In Japan and the US that has been proven when governments bail out failing large employers. Both have forced mergers and made major investments to preserve those entities. China absolutely will not allow it's market to be dominated by a single player. Examine world economic history and see if you can find a single monopoly in any business that was not created through direct government action. Then look to see what happened when some came close in the US, like Standard Oil Company, Bell Telephone, General Electric. Globally monopolies have existed but were nationalized once they became successful. Aramco and National Iranian Oil Company are examples.
To understand why global dominance of Tesla will not happen is simply to note all the national champions and major employers which will not be permitted to fail.
From a technical perspective such a thing could happen. Quite a number have come close through the industrial era.
Today SpaceX is perhaps the only proven example fo an entity that actually could become a monopoly. We all know that will not ahpemn because politicians can and do select obsolete and inferior technology to preserve political advantages. Were superiority relevant the SLS would have died at least five years ago. There is zero doubt that The EU will not let Arianespace die, nor will Russia or China cede to proven superiority.
This has nothing to do with "...it's not common or I can't think of anyone else who has done a similar thing."
It has everything to do with national pride and human behavior.
Tesla already has serious political impediments, there are legal prohibitions to direct sales, punitive duties and taxes, discouragement by imposing barriers to EVs.
There are non-tarriff barriers that, for example, prohibit foreign entities access to specific markets. There has been even a US prop[osal to provide Federal support only to unionized companies. In any given case these restrictions can be overturned. What cannot be disregarded is the willingness to penalize anybody 'who achieves too much power', whatever that means.
As we approach forecasts for Tesla we should all recognize that it is very easy for governments to invalidate patents or impose other discriminatory moves. Therefore I can be plausible for Tesla to gain a global market share more or less equivalent to that of Toyota today. The anti-competitive actions that can and will be taken makes it implausible to have much higher market share.
How to do that? Tesla will cooperate to make certain it does. Remember that the mission si to accelerate sustainable solutions, not gain overwhelming market share. Because Elon Musk believes so strongly in that objective he will help other manufacturers, as he already is right now with Supercharger access. We can forget about all the certain impediments to dominance that will be created. We only need to understand that doing so will defy the very mission of the company.
Nothing about that diminishes Tesla growth potential because the market itself will grow massively once the present state, with near-total opposition to EV's by Oil companies, petrol stations, auto dealers and even major auto companies from Toyota to BMW, with bizarre non-performance from even the ones which proclaim their Green goals. We may rest assured that global disaster must be obvious to them before they will change, but they will, and Tesla will help them.
