The problem with this argument is that you're basing it on power levels for characters in the Earth-616 timeline.
The MCU is Earth-199999.
Completely different timeline, completely different iterations of the various characters, who can all be WILDLY different. There's something about Marvel's multiverse that creates similarities, but allows for wild variance.
http://marvel.wikia.com/wiki/Multive...iverse_Listing
You can't use stuff that's true in Earth-616 to define characters in Earth-199999.
To repeat the above, they
aren't changing anything. We haven't been introduced to Earth-199999's Captain Marvel, yet; there's nothing to "change" in the first place.
Also, if everyone loved heroes for being "the strongest", Wolverine would've never been as hugely popular as he was.