Again, I think that's a cynical assumption. Looking at the article, it sounds like Downey and Feige/etc. were both thinking in terms of how to do something new, how to create an effective and authentic take on Doom as a character, and how to make it worthy of Downey's talents. I think trying to reduce that to a conversation about dollar signs is soulless and simplistic, and I want no part of that.
I don't think people are against them doing something new. For as much as I think people want Downey to play Stark I also don't think fans want his death to be under minded. So it makes sense that they will instead want to see Stark but one that went evil and became Doom or had his body taken over etc. Much like how in the Deadpool movie they didn't bring the Wolverine we saw in all those other movies. But we saw a new Wolverine. So why fans still got to see what they wanted which is Jackman playing Wolverine again they did something different enough that it didn't ruin what happened to him in "Logan."