You either die a hero or become the villan

I smell desperation. There's ten of thousands of actors out there and they decide to re-hire RDJ? It feels like they're counting on his star power to save their precious Marvel shows and/or movies. It won't help, of course, because bad casting isn't why people stopped watching. People are superhero'ed out and yet they're pumping out Marvel shit like there's no tomorrow. And I do mean shit, the quality of Marvel movies fell off sharply after Endgame. The talent just isn't there, man. Stop.

People are superhero'ed out
Deadpool 3 just had the 6th largest opening weekend of all time (and it's R-rated). People will go see good movies period, the MCU just hasn't been very good lately.
- I know it technically is a movie about superheroes, but I feel like Deadpool doesn't qualify as a standard "superhero movie"
- Okay yeah, true enough. Maybe it would be more accurate to say that people are now much less likely to go see a mediocre to bad superhero movies. To give an example, the first two Thors and Iron Man 3 weren't great, but they were still box office hits. I have to wonder if it would pan out the same way if they were released today.
People are superhero’ed out
Nah. People are bad-film'ed out.
There are comic plotlines where Dr. Doom is a variant of Iron Man. It’s not necessarily driven by some sort of desperation.
- Yes, that would be one heck of a twist... if they hadn't revealed Dr. Doom's identity at Comic-Con. And we don't even know what the movie will be called, I might add. I think that if Disney was confident in whatever movie it is they're making, they would have kept RDJ's involvement on the down-low, to surprise the audience. Instead, they made this big hullabaloo about RDJ coming back.
  Far as I can tell, the casting can be explained in one of two ways:
  This Dr. Doom is an alternate universe version of Tony Stark. But if this is true, why the heck would they spoil the reveal?
  Second option is even worse: no alternate universe chicanery. This is MCU's version of Doom. But that's just lazy casting.

Porque no los dos?

The right answer in this case

A rich billionaire or a rich monarch is hardly a different character.

Thats like Bruce changing his name into Sexy Lexy. Same char.

And all four of the mentioned characters are known to be protectors of the people (unless it affects their business or taxes).
\ Also all own power-suits.

/s (like 50%)

Damn, RDJ looks old. Is he okay?

I mean, he is almost 60? Probably just doesn't try to hide his age as much as some people.
- that's the joke
  edit: if you don't know - which I assume is why the down votes - it's a meme about internet chuds posting pictures of middle aged women who were famous in their 20s asking what happened to them.
  It started with Pamela Anderson a few months ago.

Is RDJ really a good casting for Doom? I like RDJ, but, this doesn't seem like a good role for imhis usual schtick. But I am willing to admit I am wrong.

I think RDJ comes across as a rebel bad boy, but Doom should be a more traditional honorable gentleman. In another time, Doom would be the hero.
- Maybe they're going for something similar to RDJ's Sherlock Holmes. A veneer of propriety over a ruthless and savage intelligence.

Inclusive or

or both, in this case

Both please.

A christmas glove?