I’m kind of losing the through-line of the conversation a bit now, but yes, I think it’s clear by this point that Marvel and Disney have done really well in building up the MCU and keeping it all rolling along, regardless of what narratives ‘the internet’ chooses to believe or reject.
(I think the whole idea of heavy DC/Marvel tribalism is an overly simplistic concontion that only holds true for a small minority. There will always be people who try to impose certain readings of these things based on their own biases, but as a viewer I just want good movies. Which is subjective of course, but as someone who enjoyed Wonder Woman a lot more than Infinity War I feel like I can honestly say that DC/Marvel bias doesn’t play a huge role in these things for me. )
What I think is true though is that Marvel have done well at building their brand and making sure that audiences know what they’re getting from a Marvel movie. So in that sense they’ve established themselves well, in opposition to competitors like the DCU.