I don't know how to explain it more clearly than I have without repeating myself. I'm sorry please read it again and if you really think I have made a logical error then by all means I'll listen.
I cannot see any way in which a middleman would support a precedent of creeping disintermediation by an OEM. The entire dealer lobby is obsessed by fighting exactly that. Which pretty much rules out OEM fleet wide OTA networks so long as the dealer model persists with a stranglehold on new car sales.
If I found out that a dealer service center had an OTA network that could scan my car for opportunities to charge me money I would want to sue for intruding on my private property - and like any consumer that does not completely trust car dealers to have my best interests at heart, I would absolutely refuse point blank to buy any car that granted a car dealer that kind of access.
Tesla scanning to see if they need to do something for me under warranty before something gets expensive to fix or results in a safety issue is the exact opposite because values and incentives are aligned.
A dealer is incentivised to watch and wait for a small fault to progress until ideally I die so that he can exploit the incident and the data surrounding it to trigger a full fleet wide mandatory NHTSA safety recall at the OEMs expense.
The problem is that you have been repeating yourself and not taking in alternative views which I have posted. You are like a chess player who is so convinced that you have thought through all the angles that you overlook an obvious change in strategy.
You cannot look at dealers' attitude and behavior in the past and be sure that they cannot and will not change their strategy. When dealer's start losing scores loyal customers to Tesla because their OEMS fail to deliver compelling electric products and contemporary conveniences such as OTA, you can bet they are going to change their strategy.
Let me concede that traditional ICE makers will be basket cases in the face of disruption. This of course undermines any equity the dealer may have with those brands. So repairing cars from those makers will no longer be much of a business for them. So resistance to electrics on grounds that it undermines service center revenue breaks down.
Next under this scenario that ICE brands are failing, we should expect that this creates new opening for aspiring EV makers. It does not matter much where these come from, only they are not the incumbent automakers with franchise relationships with dealers. So how will auto dealers react to these new EV entrants? Will they reject them out of hand because they are so vested in their current franchisors who are sinking like the Titanic? Or will they gladly court these new entrants so that they can put compelling products on their lots? I think the will. Now these new entrants will have to decide if they want to be wed to dealers and their franchise laws or if they will follow Tesla's lead avoid them like the plague. If they go with dealer, that's no problem for the dealers. They sign new contracts, put up signs, and sell new product. On the other hand, if new EV entrants follow Tesla's distribution model, then the auto dealers will be in a pickle. The very franchise laws that protected them from the incumbents become laws that bind them to their fate. However, if disruption is intense enough, auto dealers could change their whole political strategy. They could actually rip up the dealer franchise laws to jump into electrics.
So the whole competitive landscape can change dramatically when electrics start displacing gasmobiles in large numbers. Once electrics lead growth in auto sales, you can bet dealers will want in on that. So they have to change. Or retire their business to those who embrace the new opportunities. I believe this will be the case whether incumbent OEMs die or somehow survive. And if they die, that makes it even more compelling for auto dealers to make a break from the past. Of course, I do expect many dealerships to fail, but that is because they are simply poorly run businesses that will find it hard to adapt to a changing market. Yet other entrepreneurs will seize the opportunity to sell electrics.