I think the conclusion in all of this is that definitions (what is bitcoin) have changed, and being clear on those definitions with what Bitcoin is will help things (in a bitter sense? sure, but better than being in a messy state).
For example, considering what I know so far, from what bitcoin was at the start to how it evolved and what it is now, it's definition to me has changed from "A Peer-to-Peer Electronic Cash System" to something like "A Managed Peer-to-Peer Electronic Cash and File-Storage System".
If something else comes along that gets developed in a way that retains the original definition as closely as possible, then it'll exist and people will use it. Will it be as popular? Probably not. Will it be as resiliant with its hashing power? Probably not. And many will think of it as a shame that is the case, and maybe because of that it will never be trully successful in terms of resisting attacks, but i'd imagine that the conclusion many will have there is "better than nothing, and we'll keep trying" all the while still making use of current Bitcoin for whatever their needs are, like any other crypto.
Another thing what'll happen is that many will try to change bitcoin back to its original definition, but probably that won't happen because of short-term financial incentives/benefits. At least not until something bad happens where then most would start running to fix things. I guess we'll see what happens.
On my end? I'm just one dude and sure i'll be a part of an attempt to restore bitcoin to its original definition, and if it works out great, if not then oh well, and i'll just see bitcoin in its now new definition, that's it, as well as use whatever new thing that pops up that holds that old definition if it becomes viable. In other words, like with Ethereum or other crypto, i will *utilize* current-bitcoin, and i will utilize and *support* old-defined-bitcoin, whatever it may be. I think that's a good approach in the current state of things. To persue ideals but not to reject reality.