I just found a site from May 2015 with a survey of the most popular 100 Avengers. Pretty disapointed that a lot of these are guys I don't even consider to be Avengers (a Doombot included), but also happy D-man nearly made the midway point. I wonder who didn't make the cut. Here are the top seven, with two surprises:
7 Black Panther
6 Black Widow
2 Captain Marvel
1 Captain America
I had no idea BP and CM were that popular, beating Wolverine, Spiderman, Hulk, Vision, Scarlet Witch, etc, etc. Would this be a team worth seeing? It's not likely we will, unless we can swap in the new Cap and Thor, but I think that would be a good team too.
I suspect that the reason Wolverine and Spider-man didn't score higher on the list is because a lot of people didn't like them as Avengers. If the question had been who are your favorite superheroes, both Wolverine and Spider-man would make the top 10. I also suspect that the survey was predominantly given to twenty-somethings or younger. That's the only reason Black Widow would make the top 10.