I fail to see the connection between "Spidey doesn't exist in the MCU yet" and whatever it is you're trying to refer to in the third paragraph.
Two different actors, yes, and yet, at their core, they were both still playing the same character. They didn't use Peter Parker for the first series and then switch to someone like Ben Riley or Miguel O'Hera for the second series, or for that matter they didn't make that huge a change to who the character was.
The biggest arguable change was the whole situation surrounding his parents, and if I'm not mistaken, people didn't exactly embrace that whole plot thread with open arms.
And yet, they are all still 'Bruce Wayne'. At their core, they are all the same character - they are Bruce Wayne, Billionaire Playboy CEO of Wayne Industries who lost his parent when he was a young boy, then 'became a Bat' in order to fight crime and clean up Gotham City. They operate out of the Batcave, with the help of his loyal butler Alfred, drives around in the Batmobile and an array of other bat-themed vehicles, and use their amazing detective skills and honed fighting abilities to 'be the night' in order to fight a never-ending crusade against crime.
I would certainly hope not. That would be an extreme reaction.
Not to mention it's kind of an extreme response to go from "what about those people who want Peter Parker to be Spider-Man in the MCU" to "Hey, I'm not holding a gun to someone's head and forcing him to be erased from existence".
If you're trying to make it as a joke with the '
' in there, it really just falls flat on it's face.