Im not shooting anything down, like I said, I used to watch WWF a lot when I was a kid, digged that Attitude Era all those stories and all... WWE now I catch the trailers that come on TV while watching something else... and all I see are guys with no presence.
But coming to what you said... Soccer is WAAAAAAAAAAAY bigger internationally than WWE. Plus in the outside countries WWE is something that people once they go beyond the 16/17 demography hold no interest in. Soccer takes over lives for people.
Plus Iminime's largest sales dont come from the US, rather Asia... so keep that in mind.
I think it all boils down in the end to whether people are willing to accept some inaccuracies moreso on the body type. Customisers can make a great head and slap it to a regular muscle TT. Some like mayb Triple H can work.. others like say Undertaker would be glaringly inaccurate... etc etc
Honestly in Soccer as well as WWE (which are technically both entertainment sports) I think more than figures memorabilia is a bigger market. I know fans will kill for a Messi autographed picture/boot/shirt than over a figure of him no matter how accurate... same thing with WWE, chaps will clamour for a Rock/Bret Hart used porp/clothing than a figure maybe... the collectible spark in these sports come more from having a 'piece of your idol' than a replica of one...
But thats just my opinion...