I agree about Sam being the best candidate. I remember saying he made more sense When Bucky took over.
Now, I liked that run, and I think they found a way to make it work. Sam saying he had to stay Falcon to act as protector of Harlem, and be a symbol their worked fine.
I do think there should have been some story were Bucky says Sam should have it because he has been a hero longer... but over all it worked with Sam as his guide in the world of superhero-ing.
My first problem was that Cap had barely been back four years when he was replaced. But, that was easy enough to shake off.
I even think Sam should be a more socially active cap... to a point. It is who he is. I think there could have been some really interesting ideas with him trying to separate Cap and Sam, maybe building a type of secret identity who is more socially active, compared to the in the system Captain America.
I just think he was handled terribly, turning him into a guy who lectured people and had a lot kind of boring stories.
So in essence, that is where my view of ruining (albeit temporarily... hopefully) comes from. Not replacement, but rather just bad writing.
And even if they bring back every major character, that problem seems to be sticking around.
In principle Sam was a Cap who picks a side politically speaking, where as Rogers always straddled the line.
I didn't mind that as an idea, I simply objected to how Nick spencer used it, and Sam became the proxy by which Spencer expressed his own political opinions - or at least the stories and environments that Spencer put him in.