But in all seriousness... No. He's not. RDJ has stopped playing him. But I am sorry to tell everyone this but... RDJ is not the end all be all of this character, even though he has for a decade contributed a lot to who and what Iron Man is. But the character is bigger than him and in a way bigger than the MCU, which is just the most recent and high profile version of the character. A VERSION. There are versions that precede this one and there will be versions that come after. I guarantee you the MCU versions right now are not the DEFINITIVE versions because Marvel and Disney want to make more money in the future off them so guess what? Iron Man will still be in comics. Iron Man will still appear in movies at some point. Iron Man lives.
We need to get a grip on ourselves as fans sometimes I think.