Is Doctor Strange Taking Over From Iron Man As Lead In Further "Avengers" Sequels?

After it was confirmed that Robert Downey Jr was returning to the role of Tony Stark aka Iron Man in "Avengers 2" and "Avnegers 3", an insider close to the MCU has stated that Marvel are getting Doctor Steven Strange set up to be, well basically "being groomed to be the next Iron Man". 
Seeing as Robert Downey Jr really can't go on forever, looks like Marvel are already possibly making BIG plans to not recast him, but just move on without the character and have Doctor Strange lead the Avengers, which again is rumoured to feature the next gen of them, which makes total sense in my eyes. 
After this news, it's assumed that Strange WILL be making an appearance in "Avengers 3" to lead him into his own movie or to set up for "Avengers 4" and the next gen of phases.